Here are the answers to exercises 2b, 3, 4, 5 on pages 9-12:
2b.
1. often
2. sometimes
3. never
4. usually
5. sometimes
3.
1. He often listens to the radio.
2. They sometimes read a book.
3. Pete never gets angry.
4. Tom is usually very friendly.
5. I sometimes take sugar in my coffee.
4.
1. Often Ramon and Frank are hungry.
2. Always my grandmother goes for a walk in the evening.
3. Usually Walter helps his father in the kitchen.
4. Never they watch TV