難度：★    考點：介詞

　　1. Linda has bought a large house ________ a swimming pool.

　　A. with   B. in  C. on   D. from

　　2. I think it's not polite to laugh ______ others.

　　A. in                    B. at                        C. over

　　3. Practicing in groups is good ______ us to learn English.

　　A. at                        B. in                        C. for

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