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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）
