There doesn't seem to have been much difficulty in solving the problem.
E.g. There used to be a big tree in front of the old house.
There happened to be a foreign teacher there.
There is said to be no life on the moon.
There must have been something wrong with the machine.
19. Are the parents who let their child who is ______ walk in the dark alone at night considerate?
A. young enough B. too young to C. not old enough to D. so young
解析:分析句子结构,who is so young 在句为修饰的定语,另有let sb.do sth.
20. If you want to sell your product you must _____ it.
A. advertise B. advertise for C. advertise on D. advertise to
解析:advertise sth. 为登广告, 登广告宣传 advertise for sth.(sb.)登广告征求或寻找某物或某人
比较:advertise jobs 登广告招人 advertise for jobs 登广告求职
21. ----Any news about Bill Clinton?
----He left power three years ago and has a little now and a little then been ______.
A. heard of since B. heard since C. heard before D. heard of before
解析:答句可改为I have heard of him a little now and a little then since he left power three years ago.
He has a little now and a little then heard of since he left power three years ago.
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