下图是圆明园的残迹，它被摧毁于（    ）

周海有一些钱，他买书用去钱的一半，买文具用去剩下钱的一半，最后还剩3元钱，他原来有多少元钱？

Rainforest also help to ____   the weather. When trees are cut down, it gets hotter. Besides, one quarter of our ____  come from plants. Many of these plants can be found only in rainforests. There is a lot that we have not learnt about rainforests. If we____ them, we will never find out.

In my opinion, our future____ saving the rainforests. We must tell more people how important rainforests are so that they will stop doing harm to them. We must protect the rainforests now. We have to act now to save our only home.