6. They don't know _______ to go or wait. （if, whether）
7. We are talking about ______ we’ll go back tomorrow. （whether, if）
8. I was really surprised at ______ I saw. （where, what）
9. I don't know ____ so many people are looking at him. （how, why）
10. Do you know ______ you are studying for? （why, what）
四、句型转换。
1. “Do you want to try it?” Tom's mother asked him.（同义句）
→ Tom's mother asked him _______ _______ ______ to try it.
2. I think this is a good idea.（改为否定句）
→ I _______ ________ this ________ a good idea.
3. Lucy hasn't decided which trousers to buy.（改为复合句）
→ Lucy hasn't decided ________ _________ ________ _______ buy.
4. I don't know how I can get to the hospital.（改为简单句）
→ I don't know ________ ________ ________ to the hospital.
5. I don’t suppose they will come, _______ ______? （改为反意疑问句）
五、用所给动词的正确形式填空。
1. We are sure that he ________（go）to school tomorrow.
2. Do you know who ______（be）the first man to walk on the moon?
3. Could you tell me where the post office ______（is）?
4. Our father said that he _______（will）buy a new computer.
5. I hear that he _______（swim）in the sea yesterday.
6. The little boy tells us where his father _______（work）.
7. He said that he _________（finish）his work already.
8. They thought they could _______（hike）to the top of the mountain.
9. He was glad that so many people _____（help）him.
10. She doesn’t know whether ________（go）or wait.