题目内容：

根据要求进行句型转换（每空1分）

1.Tom was playing the piano when Mary bought a drink. (同义句转换)

While Tom _________ _________ the piano, Mary ___________ a drink.

2.Peter cut himself in the accident. (改为否定句)

Peter ______ ________ himself in the accident.

3.Why don’t you wait for us at the gate? (改为同义句)

________ __________ wait for us at the gate?

4.Emily was reading a book when the light went out. (对划线部分提问)

_______ _______ Emily _______ when the light went out?