句型转换。

1. There are over 60 students in his class. (改为同义句)  

    There are                                 60 students in his class.

2. They go to school on their bikes. (改为同义句)

    They                their bikes                                 .

3. It takes about three years to build the hospital. (对画线部分提问)  

                                                it take                build the hospita1?

4. Mary runs more slowly than the other students in her class. (改为同义句)

    Mary                                               in her class.

5. He often goes to school on foot. (改为同义句)  

    He often                                 school.