___________ should not be allowed to go out at night.
#51486
A
Twelve-years -old
B
Twelve-year-olds
C
Twelve years old
D
Twelve year olds
推荐题目
 About _____________ of the students this year were born in the 1990s.
#51004
A
three five
B
three fifths
C
third fifths
D
third fifth
_____ of the water _____ polluted. We must try to protect our environment.
#51088
A
Two third; are
B
Two third; is
C
Two thirds; are
D
Two thirds; is
May I ask you __________questions? 
#51799
A
any
B
some
C
much
D
little
—How many birds can you see in the trees?—I can see        birds in them.
#51523
A
hundreds of
B
five hundreds
C
hundred of
D
five hundreds of