（ ）1.This is_____eraser. A.a B.an C.the D./

　　（ ）2.-Is that yourbook? -__________.

　　 A.That isn't B.It isn't. C.Yes,that isn't D.No,it isn't.

　　（ ） 3.This ____ mykey. A.is B.it C.not D.no

　　（ ） 4.-Is this your schoolbag? -___________.

　　 A.Yes,it is. B.Yes,it isn't. C.No, it is. D.It isn't.

　　（ ）5.--- What's this __________ English?

　　 --- It's a schoolbag.

　　 A. to B.in C. and D. for

　　【拓展练习】

　　 一、单项选择题。

　　（ ）1. -____ this yourbook? -No, it isn't.

　　 A.Are B. Is C.Am D.be

　　（ ）2. -Is that hispen? - ____________.

　　A. Yes, it is B. No, it is C. Yes, it isn't D./

　　（ ）3. This is______________ key and that is ___________ eraser.

　　 A. a,a B. a,an C. an, a D. the, an

　　（ ） 4. -Hello! Are you Tom? -_____________________

　　 A. Yes, I'm. B. No,I'm. C. Yes, it is. D. No, I'm not.

　　( ) 5. This is not _________ pencil. It's__________ pencil.

　　 A. you, he B.she, my C. his, her D. me, his

二、句型转换。