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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