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求老师解答:根据句意及汉语提示,

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求老师解答:根据句意及汉语提示,
根据句意及汉语提示,填写单词.
1.I saw Jack sitting _____ (在……旁边) Jim talking.
2.I don't understand the meaning of this _____ (符号).
3.My sister got the answer to the _____ (谜语) very quickly.
4.Many people are against _____ (做实验) on animals.
5.He gave me a _____ (恰当的) example,so I understood it easily.
1.beside     2.symbol     3.riddle    4.experimenting  5.prope