补全对话（共5小题；每小题1分，满分5分）

阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话，使其意思完整。

A: Look, there is a bag under the tree. 1. _____________

B: I don’t know. Let’s have a look. Oh, there is a soccer in it.2. _____________

A: I don’t think so. Many girls enjoy playing soccer now. 3. _____________

B: Yes, there is an English book and a notebook in it.

A: Open them and see. 4._____________

B: OK, you are so clever. Yes, there is an English name here—David.

A: I know it must belong to a boy.  

B: Of course. 5. _____________

A: There’re some other words here——Class Eight, Grade Nine. Let’s go to find him.

－ Whose is this blue bike?

－It ________ be Mary’s. Her bike is black and white.

A．must             B．can’t            C．can              D．mustn’t

 —Look! A book is on the floor. Whose is it?

—It ______be Rick's. It has his name on it.

A. mustn't        B. can't           C. must D. need

－Wow, what a nice MP4! Whose is it?

－My aunt bought it for my brother and me. It’s ______.

　　　 A. mine　　　　　　　 B. his　　　　　　　 C. ours

－ Whose is this blue bike?
－It ________ be Mary’s. Her bike is black and white.