Bad weather may cause many traffic problems.

A. 因为
B. 导致
C. 指导
D. 遭受

Don’t spit in the classroom.

A. 吐痰
B. 打闹
C. 吵架
D. 喧哗

Yesterday, I put up a poster on the back wall.

A. 地图
B. 年画
C. 设计
D. 张贴画

Listening to BBS news is a good way to learn English.

A. 道路
B. 方法
C. 某方面
D. 方向

How can we fight against pollution at school？

A. 打架
B. 战争
C. 与…作斗争
D. 敌对

Pollution is a __________ (grow) problem.

It is a great example of ______ (recycle).

Look at the sky. It is so _________ (dust).

They want to do something about environment _______ (protect).

Put up ______ (education) posters around the school.