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Fill in the appropriate unit name in the horizontal line. The height of the desk is about 70______, the thickness of coins is about1_ _ _ _ _, and the thickness of math textbooks is about 8____.
According to the meaning and analysis of the problem:

(1) The height of the desk is about 70cm.

(2) A penny is about 1mm thick;

(3) The thickness of the math textbook is about 8 mm;

(4) Your home is about 3 kilometers away from school;

(5) The east-west distance of China is about 5,500 kilometers;

An elephant weighs about 4 tons.

So the answer is: cm, mm, mm, km, km, ton.

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