1. UNIT 1
(page 1)
1
1. predators 5. amphibian
2. reptile 6. hole
3. insect 7. jungle
4. prey
1 2
2 h c
u o
3
n m y
4
t r a p s o
5
m s t
6
m c u t e
a r
l v
7
d i s g u i s e
v
8
p r e t e n d
(page 2)
3 1. sees 5. goes
2. Do … like 6. Does … eat
3. Is … hiding 7. is chasing
4. am taking 8. make
4 1. loves 6. goes
2. wants 7. cleans
3. is studying 8. prepares
4. needs 9. does not enjoy
5. is working 10. watches
5 Accept all logical and grammatically correct answers.
........................................................................................................................................................................................
UNIT 2
(page 1)
1 1. close together 4. burn
2. tradesmen 5. horrifying
3. incredible 6. common
2 1. h 3. c 5. d 7. b 9. a
2. f 4. e 6. g 8. j 10. i
(page 2)
3 1. felt, took 3. did … leave
2. weren’t listening, 4. were writing
was talking 5. didn’t read
©
CHALLENGE 4 Photocopiable Burlington Books 1

2. 4 1. started 6. went
2. were studying 7. were waiting
3. heard 8. reached
4. didn’t believe 9. painted
5. followed 10. brought
5 1. didn’t use to wear
2. Did … use to watch
3. used to send
4. didn’t use to speak
5. used to play
........................................................................................................................................................................................
UNIT 3
(page 1)
1 1. search 4. reveal
2. conceal 5. agent
3. term 6. former
2 1. secret message 6. shave
2. graduated 7. award
3. make up 8. citizens
4. no matter how 9. ordinary
5. gadgets 10. recruit
(page 2)
3 1. have met / have never met
2. has rained / hasn’t rained
3. have graduated / haven’t graduated
4. has bought / hasn’t bought
5. have gone / haven’t gone
6. have sailed / haven’t sailed
4 1. have been searching
2. has been wearing
3. hasn’t been working
4. has been snowing
5. has been listening
6. Have … been watching
5 1. We haven’t visited Rome yet.
2. I’ve been thinking about you all day.
3. Tom hasn’t been doing his homework for a week.
4. Emily has watched this programme several times.
5. Ed has been sleeping for hours.
6. I’ve never been to South America.
........................................................................................................................................................................................
UNIT 4
(page 1)
1 1. d 3. f 7. a 9. g
2. b 5. e 8. c
4. h. the hair above the eyes
6. i. give a job to someone
©
CHALLENGE 4 Photocopiable Burlington Books 2

3. 2 1. appearance 5. fright
2. get away from 6. conservative
3. figure 7. critic
4. wonder
3 1. least appealing 5. tall enough
2. most popular 6. too wide
3. shorter than 7. the funniest
4. difficult
(page 2)
4 Accept all logical and grammatically correct answers.
Possible Answers
1. The balloon is the lightest.
2. The plane is faster than the bird.
3. The plane is the noisiest.
4. The balloon isn’t as useful as the plane.
5 Possible Answers
1. We visited the studio where they made the film.
2. That is the dog that appears in the film.
3. I met a woman who has got eight children.
4. This is the dress which the actress wore.
5. I remember the evening when we saw the film.
........................................................................................................................................................................................
UNIT 5
(page 1)
1 2 3
1 d i s c a r d p
4
w p o
5 6 7
r e c o n s i d e r
a t e r t
p w a r
8
p d w a
i i i
9
n s c u l p t
g p
10
g l a s s
a
11
r e c y c l e
2 1. masterpiece 5. exhibition
2. sketch 6. host
3. worth 7. obviously
4. encourage
(page 2)
3 1. had begun 3. hadn’t displayed
2. Had … seen 4. hadn’t eaten
©
CHALLENGE 4 Photocopiable Burlington Books 3

4. 4 1. was, hadn’t started
2. had already cooked, arrived
3. decided, had never painted
4. Had the train left, got
5. went, had never seen
5 Accept all logical and grammatically correct answers.
........................................................................................................................................................................................
UNIT 6
(page 1)
1 1. look for 4. go through 7. Go down
2. take off 5. go up 8. turn off / down
3. turn into 6. look after 9. turn on
2 1. purse 5. fabric
2. treat 6. bend down
3. queue 7. pounding
4. expect
(page 2)
3 1. are you going to do / are you doing
2. will study
3. will be
4. are going to learn / are learning
5. are you going to present / are you presenting
6. am going to build / am building
7. will finish
8. will win
4 1. see, will give
2. won’t be, exercise
3. worked, would send
4. wouldn’t wear, were
5. had locked, wouldn’t have got
6. would have found, had tidied
........................................................................................................................................................................................
UNIT 7
(page 1)
1 1. ring 6. compose
2. voice 7. hits
3. text message 8. broadcast
4. downloaded 9. sound
5. clip 10. answer the call
2 1. Y 2. N 3. N 4. Y 5. Y
(page 2)
3 1. Millions of text messages are sent by teenagers in a year.
2. Our conversation was heard by a lot of people.
3. The performance won’t be interrupted.
4. Were the dishes washed (by anyone)?
5. The computer wasn’t broken by Paul.
6. Are the cups usually recycled?
©
CHALLENGE 4 Photocopiable Burlington Books 4

5. 4 1. are used
2. are introduced
3. were purchased
4. are thrown away
5. are made
6. will … be polluted
7. will be collected
8. will be resold
9. will be recycled
10. will be given
........................................................................................................................................................................................
UNIT 8
(page 1)
1 1. feeling down 4. on the right track
2. vanished 5. ignored
3. slim
2 1. boast 6. made fun of
2. promised 7. social life
3. stand up for 8. instead of
4. selfish 9. go on a date
5. compromise
(page 2)
3 1. Bill said that his girlfriend called him every day.
2. Jen admitted that she had never driven that car.
3. The teacher warned the students that they had to read those instructions carefully.
4. Fiona reminded me that she had sold her rollerblades a week earlier.
5. The coach predicted that Tom would win the race the following year.
4 1. hadn’t seen 6. there
2. that 7. could meet
3. hadn’t been 8. would meet
4. couldn’t go 9. had had
5. then 10. the day before
........................................................................................................................................................................................
UNIT 9
(page 1)
1 1. spoon 4. roast
2. bowl 5. fry
3. bake 6. napkin
©
CHALLENGE 4 Photocopiable Burlington Books 5

6. 1
2 s
2
w e a p o n
3
s r
4
w e a l t h y i
r n
5
b a k
o n l
6 7
w i l d e r n e s s
l e t
8
d a v o i d
r
9
s q u e e z e
3 1. mustn’t 4. might
2. shouldn’t 5. Could
3. should
(page 2)
4 1. have to 4. shouldn’t
2. don’t have to 5. may
3. shouldn’t 6. have to
5 Accept all logical and grammatically correct answers.
........................................................................................................................................................................................
UNIT 10
(page 1)
1 1. c 2. a 3. e 4. b 5. d
2 1. suffer 4. poverty
2. enthusiastic 5. acquire
3. distraught
3 1. confront 5. hazard
2. distressed 6. single
3. minor 7. experience
4. support 8. curious
(page 2)
4 1. don’t want 6. had written
2. hide 7. haven’t spoken
3. haven’t shown 8. promised
4. found 9. don’t trust
5. was reading 10. will look
5 1. Who has read my diary?
2. What is making a noise?
3. Where do you hide your diary?
4. Who sits next to you in class?
6 Accept all logical and grammatically correct answers.
©
CHALLENGE 4 Photocopiable Burlington Books 6