I.
1. to/on/by
2. at/at
3. with/in.
$4$. on/in/of
5. in/of
6. on
7. on.
8. at
9. at
10. in/∅
II.
1. is raining/stay/read
2. doing/am writting.
$3$. Where will Lan and Ba go? They will visit the museum
4. will have
5. playing
6. to make
7. will be
8. will meet
9. hold
10. không có
11. go
12. are practicing
13. waste
14. to drink
15. does
16. không có
17. to come
18. are going
$III$.
1. We always come to class on time
2. How many hours does he often work a week?
3. American students do not usually wear uniforms to school.
4. không có
5. She is interested in literature, but we are fond of Math
6. không có.