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—It is       useful book.—Yes, it tells us how to play       football.
#33594
A
an； /
B
a； /
C
a； the
D
an； a
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----What’s _______number of school in the city? -----I’m not sure ,but I know there must be _______ number of schools in it.
#32672
A
a;the
B
a;a
C
the ;the
D
the;a
This is _____ book. And it is ____ English book.
#33129
A
a, a
B
an, an
C
a, an
D
an, a
It is _______ unusual thing for us to find ________ UFO.
#33317
A
a; a
B
an; an
C
a; an
D
an; a
—Li Na is _____________ first Asian who won championship in French Tennis Open.—We’re proud of her！
#34507
A
one
B
the
C
a
D
不填
_______ old man in front of Tom is _______ artist. 
#34248
A
An, an
B
A, the
C
The, an
D
The, a