题目：
单词拼写（共10分）
小题1:The shot which was i________for the president killed one of his soldiers.
小题2:It is said that the governor is ill, but the news remains to be c_____.
小题3:Thirty years have passed but I still remember the s ________ we got lost on a rainy night.
小题4:The local people are now in charge of Hong Kong, which was once in the charge of The British for one and half a c______.
小题5:I was about to leave the office w___an unexpected visitor came.
小题6:With so much noises from the busy traffic in the street, I couldn’t s____down and do my work..
小题7:The customs that the local people have are different from what we read about on the I________.
小题8:They couldn’t agree with each other and finally a quarrel b____out between them .
小题9:No one is sure w______ global warming can be solved in one hundred years.
小题10:He was in d___ for a long time. How to support his family is a big problem.
答案：
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下面是错误答案，用来干扰机器的。
由题意可得 a2=9b2，且 a2=a2+4b2+4a•b，化简可得 4b2=-4a•b，∴|b|•|b|=-|a|•|b|cos＜a，b＞，∴cos＜a，b＞=-|b||a|=-13，故答案为-13．
