In order to find the missing child，villagers ________all they can over the past five hours.
A. did B. do
C. had done D. have been doing
—Alvin，are you coming with us?
—I'd love to，but something unexpected ________.
A. has come up B. was coming up
C. had come up D. would come up
—Look！Somebody ________the sofa.
—Well，it wasn't me.I didn't do it.
A. is cleaning B. was cleaning
C. has cleaned D. had cleaned
—I remember you were a talented pianist at college.Can you play the piano for me?
—Sorry，I ________the piano for years.
A. don't play B. wasn't playing
C. haven't played D. hadn't played
假定你是李华，正在一所英国学校学习暑期课程，遇到一些困难，希望得到学校辅导中心(Learning Center)的帮助。根据学校规定，你需书面预约，请按下列要点写一封信：
1．本人简介；
2．求助内容；
3．约定时间；
4．你的联系方式(Email：lihua@1236.com；Phone：12345678)。
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Look forward to your reply.
Yours，
Li Hua
文中共有10处语言错误，请在有错误的地方增加、删除或修改某个单词。每处错误及其修改均仅限一词；只允许修改10处，多者（从11处起）不计分。
I visited my aunt in a countryside near the city last week. I was surprised to see that great changes had been taken place in the countryside. Take my aunt's family for example. They supply preciously trees and flowers to the stores in the cities and have over ten workers working for themselves. Their family's income reached as much 100,000 yuan last year. Not only did they have a house, a car and computers, they can also afford a trip abroad every year. When asking what else they needed most, they said that they wanted to learn a few English so that they could do business with foreigners directly. To their delighted, my cousin can use he has learned from university to help them with overseas trade.
