–Can I help you?
一Yes. I’d like to buy ____ eraser.
A.a B.an C. the

-What are you doing now, Lily?
- I _music.
A. am listening to
B. listen to
C. will listen to

-Tony, where is your new classroom?
-It's on the _floor
A. three B.third C,one third.

-Excuse me, what's the of the apples?
- It's 10 yuan a ki1o.
A.price B.size C.weight

_How can we live a greener life?
_we should save_ energy and reduce pollution.
A.no B.less C.more