1. I suggest using bicycles or public buses.

2. I wish I could find the answers to these questions.

3. Mr.Quang said that he had to leave then.

4. In no way Keith can be held responsible for the accident.

5. I like reading books which are tell about different people and their cultures.

6. He is very intelligent enough to solve all these problems.

7. Unless you try to work hard, you will fail in the exam.

8. The Prime Minister set up a committee of financial experts in order to help him discuss and formulate policies.

1) Let's use bicycles or public buses.

→ I suggest using bicycles or public buses.

2) I can't find the answers to these questions.

→ I wish I could find the answers to these questions.

3) ''I must leave now,'' said Mr.Quang.

→ Mr. Quang said that he had to leave then.

4) Keith certainly can't be held responsible for the accident.

→ In no way can Keith be held responsible for the accident.

5) I like reading books. Books tell about different people and their cultures. (Which)

→ I like reading books which tell about different people and their cultures.

6) He is very intelligent. He can solve all these problems. (enough)

→ He is very intelligent enough to solve all these problems. (enough)

7) You don't try to work hard. You will fail in the exam. (Unless)

→ Unless you try to work hard, you will fail in the exam.

8) The Prime Minister set up a committee of financial experts. They were to help him discuss and formulate policies. ( in order to) 

→ The Prime Minister set up a committee of financial experts in order to help him discuss and formulate policies.