句型转换。

1. It took us 2 hours to finish the work. (改为同义句)

    We ______ 2 hours ______ the work.

2. Tom is taller than any other boy in his class. (改为同义句)

    Tom is ______ ______ boy in his class.

3. They had lunch at school yesterday. (改为否定句)

    They ______ ______ lunch at school yesterday.

4. The Olympic Games are held every four years. (对画线部分提问) 

    ______ ______ are the Olympic Games held?

5. The government didn't want foreign engineers because they wanted a

     Chinese engineer for a Chinese railroad. (对画线部分提问) 

    ______ didn't the government ______ foreign engineers?