=>
I/
1. (should) stop
2. dining
3. make
4. leave
5. helping
6. go
7. do
8. see
9. asking
10. work
11. eat
12. meeting
13. started
14. going
15. haven't seen
II/
1. If you don't hurry up, you will miss the bus.
2. Unless you study hard, you will fail the exam.
3. If Today weren't hot holiday, we would go for a picnic.
4. If I had the key, I could get into the house.
5. If we had a lot of money, we would buy this house.
6. I suggest spending the summer vacation in Da Lat.
7. I suggest that Nga and Hung join the party.
8. I suggest painting these walls pink instead of yellow.
9. Why don't you go to the cinema now?
10. I suggest that we go abroad for our holiday this year.