4.　　 为了节约资源，我们要爱护我们的物品以便它们能长时间使用。

In order to save resources, we should look after our things ______ ______ they can last a long time.

3.　　 在你买新东西之前，想一想是否真的有必要。

　 　 Think whether it is really necessary before you buy _________ __________.

2.　　 怀特一家在扔垃圾之前总是要将它们分类。

　　　 The Whites always sort the waste before _________ _________ _________.　

1.　　 虽然我们年纪小，我们仍然能为保护环境做一些事情。

　　 _______ we are young, we can still ________ _________ to protect the environment.　

6. More and more people have _______ _______ _______ collecting waste to keep our environment clean.

5. The twins look the same and we can’t _______ _______ the differences between them.

4. We should protect our earth _______ _______ _______ _______.

3. Everyday activities can _______ _______ _______ _______ the environment.　

2. Jim stayed at home yesterday _______ _______ going to school.

1. Reading in the sun will _______ _______ _______ our eyes.