These trees (在.中起重要作用）keeping the ear

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These trees____ ____ ____ ____ ____(在.中起重要作用）keeping the earth.
每空一词
____ ____ ____ ____(对......来说，......是不可能的）such a small child to work out this problem.

很高兴能够在这里回答你的问题,应该为：
These trees (play an important role in）keeping the earth.

Please ____ these books ____ the classroom. The two girls ____ ____ ____ ____. 英语翻译____ ____ the book ____ ____? 1.Tom ____ the accident ____ ____ ____ ____ (亲眼目睹）.He could These are ____ (secret) The water is very clean.(感叹句） ____ ____ ____ 汉译英,填空公交车通常在7：30送他去上班.the bus ____ ____ ____ ____ ____ ____ 英语翻译but the boats ____ ____ ____ 英语翻译____ you ____ ____ the ingredients. 英语翻译The bird ____ ____ ____ _____. They ____ ____ ____ in the afternoon Where ____ you ____(be) these days?