My mother often _________ to work by bus, but she _________ to work yesterday. (    )

A．went; drives

B．goes; drives

C．goes; drove

__________ you at school? (   )

A．Was

B．Is

C．Were

He  into the kitchen.

A．went

B．want

C．win

My sister   to school yesterday because she  ill. ( )

A．didn't go, was	B．doesn't go, was
C．didn't go, is	D．doesn't go, is

用所给单词的适当形式填空。
【小题1】Do you know how ____________ (protect) the Earth.
【小题2】What can we do ___________(keep) our city clean?
【小题3】--Look at the sign. You can’t talk here.
--Sorry. We ___________(not see) it just now.
【小题4】He would like____________ (go) shopping with you.
【小题5】What __________（make）the river dirty?
【小题6】Well ________(do), children!