1.(這個計劃成功的關(guān)鍵) ___________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______________( 習(xí)慣了學(xué)生遲到 ) his lecture.
5. I prefer to communicate with my customers ______( 通過寫電子郵件而不是打電話)