短文填空，用括号中所给英文单词的适当形式填空或根据汉语提示写出英语单词(必要时注意形式变化)，完成1-10题(每空不超过两词)。并将答案用0.5毫米黑色签字笔写在答题卡相应的位置上，每小题1.5分，共15分。
To understand why the Earth is warming up.    (one) of all, we need to understand why it is warm. Our planet   _ (cover) with atmosphere(大气）.Sunlight passes    (通过) the atmosphere and reaches the Earth. The Sun heats up the   _ (Earth) surface. When the heat rises into the air, it is stopped by some special gases in the atmosphere like CO₂, the (hot) returns to the Earth and keeps it__(warm) .
Power stations and cars release (释放) so    (much) greenhouse gases every day. So we can help stop global (全球的) warming by using less electric things such as     (关掉) lights when we leave a room, or asking our parents to turn down the heating in our house          (save) energy. We can also stop global warming by finding other     (way) of transportation. For example, ride a bicycle or walk instead of going by car. Another way to help stop global warming is to plant and care for trees. Because trees take in CO₂, they are our best friends when fighting against global warming.