Trees ________ the air clean. (    )

A．keeps

B．keep

C．kept

用所给词的适当形式填空。
【小题1】What did the doctor _______________（say）yesterday?
【小题2】The girl ___________（take）exercise every morning.
【小题3】We should sleep at least 8 __________（hour）each night.
【小题4】Don’t ___________（drink）too much coke.
【小题5】Everyone wants to __________（stay）healthy.

Please ______ . （   ）

A．holding

B．speaking

C．hold on

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

用所给词的适当形式填空
1. How _______(do) the lemon smell? It’s nice.
2. How do the _______(glass) feel? They are hard.
3. Taste it. Is it _______(salt)? Yes, it is.
4. The coffee _______(be) very bitter.
5. Let’s _______(play) together.
6. I like hamburgers. _______(I) too.