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).

根据汉语提示完成句子：Can you ________ (看)a bird in the tree?

Can you _______ it to your friends? (  )

A．tell

B．tells

C．told

D．is telling

Let me ___________ to the library. （    ）

A．go

B．goes

C．going

The kite can ________ high in the sky. (   )

A．fly

B．flying

C．flies