阅读下列句子，根据所给开首字母，写出符合句子意思的本学期所学单词，注意必要的形式变化。
【小题1】There are two hundred boys rranging from seven to fourteen in age.
【小题2】Dr. Yuan Longping searched for a way to increase a rich hharvest without increasing the area of fields.
【小题3】When Liu Xiang won the 110-metre hurdle race, he was ssurrounded by the clicking cameras of the media.
【小题4】You’d better bbehave yourself or else you’ll be in deep trouble when Mr. Wang es in.
【小题5】The Spring Festival Gala has developed into an occasion that most Chinese find it hard to ignore, and millions of vviewers are watching the performance being broadcast live.
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