They don't have tennis rackets.
He has a great _A__ collection.A.basketball B.basketballs
Today is my birthday.I ___A_ thirteen.A.am B.be
你想要多少钱?__How__ __much__ do you want?
----Hi.How's it going?----__C__.A.I will go to school B.I'm going to the zoo C.Not bad
They are _A/B _____ students.A.all B.both （A指三者及上都,B指两者都,此处they指代不明,故A 、B均对）