1. She is a woman teacher. (改为复数形式)
    They are ______  ______.
2. The twin needs some bananas. (改为否定句) 
    The twin ______ need ______ bananas.
3. You mustn't throw anything at the animals when you are in the zoo. (改为祈使句)
     ______  ______ anything at the animals when you are in the zoo.
4. The Changjiang River is the longest river of China. (用Yellow River 改为选择疑问句)
    ______ is the longest river of China, the Changjiang River ______ Yellow River?
5. I don't think you can finish it on time. (改为反意疑问句)
    I don't think he can finish it on time, ______  ______?
6. The river is 10 meters wide. (对划线部分提问)
    ______  ______ is the river?
7. Not only Tom but also Bob has been to that island. (改为同义句)
    ______ Tom and Bob ______ been to that island.
8. I sent a letter to you last month. (改为被动语态)
    A letter ______  ______ to you last month.
9. Your living-room is very bright. (改为感叹句)
    ______  ______ your living-room is!
10. Does the earth go round the sun? My son asked the teacher. (合并为宾语从句)
     My son asked the teacher ______ the earth ______ round the sun.