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13. I try to get to school (in, on) time to have a cup of coffee before my first class. 14. He will leave for Thailand (at, in) the end of August. There will be a farewell party for him (in, on) the twentieth of August. 15. Columbus discovered America (in, on) 1492. 16. The projector broke down twice (for, during) the showing of the film. 17.
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