need无人称和数的变化，可以直接加not构成否定句，也可直接提到句首变为一般疑问句。

You needn't worry about that. 你不必为此担心。

Need we finish the work before Saturday?我们有必要周六前完成工作吗？

例： He comes to school early every day. 他每天很早来上学。（school是地点名词）

Please come here before 10:00. 请10点前来这儿。(here是地点副词)

6.buy的用法：做及物动词，意为"买，购买"，后接名词或代词做宾语。

I want to buy some apples.我想买点苹果。

buy后接双宾语，即用于buy sb sth或buy sth for sb结构，意为"给某人买某物"

My mother buys me new clothes every year.

＝ My mother buys new clothes for me every year. 我妈妈每年给我买新衣服。

7.sell的用法：sell及物动词，意为"出售；销售；卖"固定搭配：

sell sb sth ＝ sell sth to sb 意为"卖某物给某人"

They are going to sell me their books.＝They are going to sell their books to me.

他们打算把他们的书卖给我。

Unit 7 同步测验

第二部分 英语知识运用 （35分）

I. 单项选择题（15分）

( ) 21. Cindy is _______ eleven. She is _______ nice girl.

　　A. an; a B. a; an C. 不填, a D. an; 不填

( ) 22. Mom, I want a new pencil box_______ school.

　　A. for B. with C. of D. about

( ) 23. The photos _______ nice.

　　A. meet B. look C. see D. watch

( ) 24. This hat is ________ for me. I want a small one.

　　A. long B. big C. tidy D. fun

( ) 25.---How much is your shirt?

---_______ 50 yuan.

　　A. I'm B. You're C. They're D. It's

( ) 26. I can't find my shoes. Where are________?

A. these B. those C. they D. them

( ) 27. David wants_______ about the food for dinner.

A. think B. thinks C. thinking D. to think

( ) 28.---Can I help you?

--- _____. I want a sweater.

A. No, not. B. Don't help me. C. Yes, please. D. No, thanks.

( ) 29.______ boys, you can buy shorts for only 30 yuan.

A. For B. In C. About D. To

( ) 30. It's only 10 yuan. You can buy it at a good _______.

A. sale B. price C. short D. sport

( ) 31. Sam's father ________ fruit in a small store.