There (be) a few books and a pen on the desk.——青夏教育精英家教网——

摘要： There (be) a few books and a pen on the desk.

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There is a piece of work．It takes Mr．A alone 20 days to finish，and Mr．B 30 alone days to finish．It takes them（　　）days to work together to finish the work．

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5、If a is odd number，the there must exist an integer n such that a²-1=（　　）

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There are nineteen boys and twenty-eight girls in our class. 1 　the boys is English. His 2 is Sam. He is thirteen. Two of the 3 are American. They are twins. 4　names are Lucy and Jane. They are twelve. They are my 5　. All of the other boys and girls are 6 　. We all like the English boy and the American girls, 7 they like us, too. We play games together（一起）. We help 8 and they help us.
　　Look, there 9 the twins! They are coming this way. Let's 10 hello to them.

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文中共有10处语言错误，错误涉及一个单词的增加、删除或修改。
增加：在此处加一个漏字符号(∧)，并在其下面写出修改的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在其下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从十一处起）不计分。
Dear sir,
　　    I'm glad to recommend (推荐) my friend Li Ming to you. Li Ming was born in July 15, 1974 in Beijing. He graduated from Xisi Primary School in 1986 .When he was in the middle school, he did good in maths, physics and chemistry and fond of art. After graduating from No. 4 High School, he entered Beijing University study physics. After four year of hard work there, he went to the United States for further study. Because of his excellent work, he get a doctor's degree in physics in last year. He is now in good health but would like to make contributions to our country．I will be most gratefully if you consider my recommendation．
　　    Looking forward to receive your early reply!
　　　　　　　　　　　　　　　　　　　　              Yours truly,
　　　　　　　　　　　　　　　　　　　　              Wang Lin 查看习题详情和答案>>

文中共有10处语言错误，错误涉及一个单词的增加、删除或修改。
增加：在此处加一个漏字符号(∧)，并在其下面写出修改的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在其下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从十一处起）不计分。
Dear sir,
　　    I'm glad to recommend (推荐) my friend Li Ming to you. Li Ming was born in July 15, 1974 in Beijing. He graduated from Xisi Primary School in 1986 .When he was in the middle school, he did good in maths, physics and chemistry and fond of art. After graduating from No. 4 High School, he entered Beijing University study physics. After four year of hard work there, he went to the United States for further study. Because of his excellent work, he get a doctor's degree in physics in last year. He is now in good health but would like to make contributions to our country．I will be most gratefully if you consider my recommendation．
　　    Looking forward to receive your early reply!
　　　　　　　　　　　　　　　　　　　　              Yours truly,
　　　　　　　　　　　　　　　　　　　　              Wang Lin 查看习题详情和答案>>