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21. Chatting online can be _____fun, but kids must be sure they stay safe on _____web.        A. 不填; a                 B. a; the               C. 不填; the                 D. a; a 22. Life is like a long race _______ we compete with others to go beyond ourselves．        A. which                  B. what                  C. that                         D. where 23. It’s a common scene in the film Tangshan Earthquake that families cry helplessly over _____ is left of their homes.        A. what                 B. which           C. there                    D. it，大小：498 KB