10. once
adverb
1. one time every week etc., as a regular
activity or event
– I visit my mom once a week.
2. in the past, at a time that is not stated
– I once saw the president of the United States.
16. later
• Adverb
– after the time you are talking about or after the
present time
– I’ll see you later!
17. miss
• Verb
• (1) Not to do something
– I had to miss school yesterday because I was sick.
• (2) To feel sad about somebody or something.
– I miss my native country.
– I miss my mom.