1. It's very important to keep the enviroment clean.
2. The time chanie will be shown to the public when they are finished.
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 than she does .
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?
