1. on
2. in
3. next
4. on
5. at
6. to
7. in
8. in

Ex7:
1. What do you do in the evening?
2. When does Tam have Math?
3. Where is his school?
4. What does Hang do after school?
5. What date is it today?
6. What time does he go to school?

Ex8:
1. more intelligent than
2. more beautiful than
3. easier than
4. more convenient than
5. the most exciting
6. the tallest
7. more expensive than
8. faster than
9. more modern than
10. the hottest

Ex9:
1. go -> goes
2. have -> has
3. in -> on
5. Mai -> Mai's
6. floor -> floors
7. on -> in