We can gain valuable experience from the mistakes which _____ to prevent them from happening again.
A. should be avoided B. might be avoided
C. must have been avoided D. could have been avoided
You can enjoy every right the law has given you, but make sure all your behavior is within the _____ of the law.
A. judgments B. influences
C. boundaries D. functions
_____, in some countries, people can play tricks on each other before noon on April 1 but they’ll be foolish if they do it in the afternoon.
A. By nature B. By standard
C. By tradition D. By law
The mixture of better jobs and greater chances of self-promotion is _____ lies behind the return of oversea Chinese high-tech talents.
A. why B. where
C. what D. when
Life doesn’t count for much _____ you’re willing to do your small part to leave our children a better world.
A. unless B. when
C. though D. if
假定你是某国外旅游杂志的编辑，最近要刊登了一组世界文明古迹的图片，其中包括下面的图片。请你根据所给关键词，用英语写一段说明，以便随图刊登。
The Great Wall
about 21,196 kilometres
15 provinces and cities
more than 2,000 years
the Spring and Autumn period
Qin Shihuang
注意: 1. 词数150左右； 2. 可适当增加细节，以使行文连贯。
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