The policeman signed to a driver to ______to check if he had drunk.

You look well. The air and the sea food in Sanya must _______ you, I suppose.

Robots（机器人）are to do the samethingspeople.

下列各句中，没有语病的一句是（ ）

_____ with the problem of heavy traffic, more and more people prefer to take buses rather than drive cars [ ]