All passengers _____go through safety check before they take a plane．（ ）
| A． |
can |
B． |
may |
C． |
must |
D． |
ought |
Must we clean the classroom at once？
No， you ________． You may clean it after school．（ ）
A．mustn'tB．needn'tC．can't
When are we going to see the movie Zoo Topia， this afternoon or tonight？
________ is OK． I'm free today．（ ）
A．EitherB．BothC．Neither
We all know that ________ birds fly to Dongting Lake in winter．（ ）
A．millionB．millions
C．millions of
I read ________ unusual story last night． ________ story is about Dr． Zhong Nanshan．（ ）
A．an；AB．a；TheC．an；The
Judy， could you tell me ________ the schoolbag？
Oh， yes． I bought it in a store on the Internet．（ ）
A．where did you buyB．where you bought
C．where you will buy