=>
I/
1. Have you finished your homework yet?
2. This printer I'd under guarantee.
3. We haven't had a vacation since last year.
4. They give away warm clothes to homeless people in Ha Noi.
5. Volunteering makes a difference in our community.
II/
1. Have you been
2. Did she go
3. Have you ever been
4. Did you go
5. Has he done
6. Hasn't finished
7. Did you play
8. Have you ever played
9. Have never been
10. Did you usually spend/were