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1.(这个计划成功的关键) ___________is good planning.
2. The specific use of leisure______(每一人都不同)
3. The ship ' s generator broke down and the pumps____________________( 不得不用手工操作 ) instead of mechanically.
4. Although punctual himself, the professor was quite used______________( 习惯了学生迟到 ) his lecture.
5. I prefer to communicate with my customers ______( 通过写电子邮件而不是打电话)
