难度：★    考点：介词

　　1. -How do you learn English words?

　　__________ making flashcards.

　　A. To          B. By          C. For         D. With

　　2. Her mother goes to work ______    bus every morning.

　　A. by             B. at                         C. on                  D. in

　　3. We can't pass the exam, ___________we study hard.

　　A. because       B. and          C, unless               D. or

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