根据句意或中英文提示写出所缺单词。
1. Water covers about three quarters of the earth's ____ .(表面)
2. ____ (though) he is very clever, he doesn’t work hard at his lessons.
3. Are you ____  (sure) Mr Wang will come to our meeting?
4. ____  with life on Earth, life on Mars will be better in many ways.(比较)
5. The Great Wall is one of the ____  (unusual things that fill people with surprise) in the world.

翻译句子（）。

若为佣耕，何富贵也?

已知一个正方体的所有棱与空间的某一平面成角为α，则cosα的值为（　　）

一个长4分米，宽3分米，高5分米的长方体鱼缸，倒入水后量得水深3.5分米，倒入的水是（  ）升．

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