用when或者while填空

1．________ Tom was eating supper, it began to rain outside.

2．Don't use your cell phone ________ you are driving a car.

3．What were you doing ________ Mr. Zhou came in?

4．Jim is good at math ________ Mary is good at English.

5．We were watching TV ________ the electricity was off.

6．________ Peter was sleeping, a thief broke into his house.

7．It snowed ________ we arrived in Tokyo.

8．She left her hometown ________ she was five.

9．I was studying in the library ________ the UFO landed.