1 . Punishment varies according to the g________ of the offence. (根据首字母单词拼写)
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2 . If you leave your arms out,they will float free in zero ________ (重力). (根据汉语提示单词拼写)
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3 . As we all know, the force of _______ (重力) makes things fall to earth. (根据汉语提示单词拼写)
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