1. (2015 江苏镇江中考) Ma Yun,the Chairperson of Alibaba Group,has made much money       the Internet.

   A. through   B. along   C. across   D. towards

3. You should remember        (lock) the door after class.

4. Water is important and        (value) ，so we shouldn’t waste it.

5. We should fight against the air        (pollute) .

1. Trees can produce various        ( chemical) to protect themselves.

2. The joke made us        (laugh) and we were happy.

5. You can’t use the swimming       (水池) today.

3. They often do some       (实验) in chemistry lessons.

4. The river       (上涨) after the heavy rain.

1. Swimming can       (锻炼) your whole body.

2. What       (覆盖) three quarters of our Earth?

5. 我让浴室的水龙头开着。

I                           in the bathroom.

4. 到人们净化我的时候了。

It is       for people             me.

3. 他从浴室里出来。

He                    the bathroom.

2. 他环顾四周，但那儿没人。

He             ,but there was                    .