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).

I will _____ my name _____the picture. (    )

A．put; in

B．put; on

C．put; up

A: What did you _______ (eat) last night?
B: I _______ (eat) some rice and meat last night. And I’m going to _______ (eat) some apples tonight.

We should _______ our hands_________eating. (    )

A．wash; after

B．washes; before

C．wash; before

Let’s help my mother ______ dinner. （    ）

A．making

B．makes

C．make