Ⅳ.句型转换
【小题1】A: Greeting each other with a smile is necessary in our daily life. (根据A句的意思完成B句，使两句的意思基本相同)
B: ______ is necessary ______ greet each other with a smile in our daily life.
【小题2】There are five million people in our city. (对画线部分提问)
______ ______ ______ are there in your city?
【小题3】In order to protect the environment, we turn off the light when we leave the room. (改为同义句)
We turn off the light when we leave the room ______ ______ we can protect the environment.
【小题4】My home is not far from my school, so I often go to school on foot. (改为同义句)
My home is ______ ______ my school, so I often go to school on foot.
【小题5】They have known David for over 20 years. (改为同义句)
They have known David for ______ ______ 20 years.