9:
1. Have you finished your homework yet?
2. Have you ever done volunteer work?
3. Do you want to become a volunteer?
4. We raise fund for homeless children in Hanoi.
5. We provide education for disabled children.
6. Most of the volunteers have been Americans.
7. Volunteers take the responsibility of making a better world.
8. How do you think we can help the disabled children?
10:
1. Tom has recycled rubbish for two years.
2. We bagan donating books and clothes 10 years ago.
3. We haven't seen her since Christmas Day.
4. This is the first time I have eaten this kind of food.
5. It has rained for an hour.
