合同的期限，时间宜实不宜虚，宜具体不宜笼统，最好确定具体年月日，如不能确定，应用“以前、以内”，而不应用“以后、明年、秋季”，也不可用“尽可能在、争取在”等模糊词表述。
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合同如有附件需注明，其与合同具有同等法律效力，如工程项目表、工程进度表、工程图纸等。
A. 对
B. 错
I don`t know if she ___ me when she ____ in five days. 答案(
A. tells, arrives
B. tells, will arrive
C. will tell, will arrive
D. will tell, arrives
How many hours ______ to fly to New York from Paris? 答案(
A. do you spend
B. does it cost
C. does it take
D. do you take
Grandmother _______ a cold since last Sunday. 答案(
A. has caught
B. has had
C. had had
D. had
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