题目内容：

句型转换

1. The hungry boy ate up all the food on the plate. (变为被动语态）

All the food on the plate 1._________2.__________ up by the hungry boy.

2. Mary bought a new car two weeks ago. (用完成时态改写）

Mary 3._________4.________ a new car for two weeks.

3. Work hard, or you will fall behind your classmates. (改成条件状语从句)

5.________ you work hard, you will fall behind your classmates.