Sure! Here are the answers for each question based on the context you’ve provided:

1. B. doesn't know
2. C. fell
3. A. best
4. A. embarrassed
5. A. timid
6. D. ancient
7. A. Will you?
8. D. sleeping blue polyester bag
9. D. to have
10. A. had
11. B. afraid I do
12. A. would have done
13. D. most expensive
14. A. does the movie begin
15. B. the amoeba, which reproduces
16. C. made us very happy then
17. A. that
18. A. B
19. D. glasses and contact lenses may be formed
20. D. May I borrow a pencil, please?

If you need further assistance or details, feel free to ask!