(   ) 1. Although his behavior was very funny,I tried hard     . Because it was impolite.

   A. not to laugh   B. to not laugh

   C. not laughing   D. not laugh

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on,one,give,change,take,letter,while,because,stay,fast 

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A: 1.       

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5. It's very impolite       (keep) others       (wait) .

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11. Alexander Graham Bell       (發(fā)明) the telephone in 1876.

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