问题
填空题
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.
答案
1. beside 2. symbol 3. riddle 4. experimenting 5. proper