用所给单词的适当形式填空。
【小题1】Water is very________(use).
【小题2】We use wood________(make) chairs.
【小题3】Trees help________(keep) the air clean.
【小题4】________(protect) the Earth, we should________(save) water.
【小题5】Look! They________(do) a project.
【小题6】Please tell________(they) about Christmas.
【小题7】He starts________(sing).

We’ve _____ Lingling’s report.   (   )

A．got

B．get

C．have

Grandparents to America before.  (   )

A．went

B．has been

C．haw gone

D．have been

— Where is Tommy?  (   )
— He the library.

A．has been to

B．has gone to

C．goes

D．went

I ________ got a new toy.

A．have

B．has

C．do