1) Improving your study habits will improve your grades.

　　2) Teaching gives me pace, and variety, and challenge, and the opportunity to keep on learning.

　　3) Being very short of money and wanting to do something useful, I applied.

　　4) Having little in common is a frequent cause of divorce.

　　5) Owing sets of books is useless unless you read them.

　　6) Drinking, eating, and smoking excessively can do severe harm to even a young person’s health.

　　7) The art of communication requires learning the language and culture of the audience.

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（实习编辑：高奕飞）