People always use wood chairs, chopsticks and many other things. (   )

A．make

B．made

C．making

D．to make

Wood can be used chopsticks. (   )

A．make

B．making

C．to make

D．made

We must keep the environment . (   )

A．cleans

B．clean

C．cleaning

D．cleaned

Shall we buy vegetables tonight?(   )

A．some

B．any

C．a little

D．few

—Must we save paper? (   )  
—I'm afraid we .

A．need

B．needn't

C．must

D．mustn't

The climate is getting from bad to worse people pollute the environment.  (   )

A．if

B．and

C．because

D．but

Choose the best words or expressions and complete the passage (选择最恰当的单词或词语完成短文)
We know that trees are useful in our_______________life. They give us wood,oxygen, rubber, medicine and many other things. They can_______________tell us about our climate (气候). If you_______________a tree trunk, you can see that it has many rings (年轮).Most trees grow one new ring every year. Because of this reason, we know the_______________of a tree. A tree over a hundred years old means that it has more than a hundred rings. When the climate is dry or very cold, the trees do not grow very much and their rings are usually_______________. When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the climate changed suddenly. We can learn about the climate for a hundred years. We can see_______________our climate is changing today.

【小题1】

A．every day B．everyday C．every day's D．every day's

【小题2】

A．not B．too C．to D．also

【小题3】

A．cut across B．climb up C．walk past D．look at

【小题4】

A．size B．length C．age D．weight

【小题5】

A．big B．thick C．small D．thin

【小题6】

A．how B．why C．when D．what