用should或shouldn’t填空，完成下列句子。

You ____ walk in the corridor. You ____ run.

You ____ talk in class. You ____ listen to the teacher carefully.

You ____ push your classmates. You ____ be kind to them.

You ____ be noisy or run in the swimming pool. You ____ line up.

You ____ always listen to the older people. You ____ talk loudly.

图（一）是五种物质之间的转化关系．用“一”表示两种物质之间能发生反应，用“→”表示一种物质可以转化为另一种物，A、B、C代表三种溶液的溶质，图（二）是用两个圆表示的一些信息，圆相交部分表示公共信息．根据图示回答下列问题：

We____ ____at 4：00 in the afternoon and____ ____we go home together．

森林生态系统有“绿色水库”“地球之肺”之称．（判断对错）