The public sign in the library means people ________ smoke there.
could
must
couldn’t
mustn’t
They come from the USA. They are _______. A.Chinese B.America C.Americans D.China
December is the ______ month in a year.
Which is the way _____ the post office?
_______ at the traffic lights, please.
----_____does your mother do? ----She is a teacher in a middle school.