8. I was really surprised at ______ I saw. (where, what)

7. We are talking about ______ we’ll go back tomorrow. (whether, if)

6. They don't know _______ to go or wait. (if, whether)

5. I really don't know ________ the bridge will be finished.（how long, how soon）

4. He always thinks ______ he can do better.（how, who）

3. She said _____ it wouldn't matter much.（that, if）

2. Do you know ______ else is going to be on duty today？（who, whom）

1. Jim told me ____ he didn't go fishing yesterday afternoon.（how, why）

(   )30. Do you know _____ they listened to yesterday evening?

A. what     B when    C why    D how             

(   )29.I don't know ___ they have passed the exam.

A. what  B. if  C. when  D. where