3. He was delighted that his aunt sent him a letter.

4. People recycle old car tires to make shoes and sandals.

5. I'm very sad not to be accepted in that group.

6. I haven't spoken to her for 3 years.

7. Tam used to type faster.

8. My father asked me to turn down the radio for him.

9. It is Lan's 15th birthday next week.

10. When did you start using the pen?

XI.

1. Minh has collected stamps since he was a child.

2. I am not working tomorrow so we can go somewhere.

3. They are going back to England in two months.

4. TV is not only bringing information but also entertainment.

5. At home on the farm, life is always a struggle with nature.