句型转换。

1. Mr. Li began to teach English in this school in 1999. (同义句转换)

    Mr. Li _______ ________ English in this school since 1999.

2. Our monitor has been a League member for two years. (同义句转换)

   Our monitor ________ the League two years ago.

3. My grandpa had to collect water from the village well. (改为反意疑问句)

   My grandpa had to collect water from the village well, _______ ________?

4. They can hardly believe it. (改为反意疑问句)

    They can hardly believe it, _______ _______?

5. He spent hours cleaning out the refrigerator. (同义句转换)

   He _______ hours _______ _______ out the refrigerator.