---How many teachers are there in your school? ---I’m not sure about it. Maybe  .
#51684
A
hundred
B
hundreds
C
hundreds of
D
one hundred
推荐题目
          of the students in our school are boys. 
#51285
A
Second-threes
B
Two-third
C
Second-twos
D
Two-thirds
You can watch TV ______, but you can’t watch it ______ a long time.
#51529
A
one, at
B
one, for
C
first, for
D
first, at
 ___________ 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
Our school has a big library. There are about ten        books in it.
#51557
A
thousand
B
thousands
C
thousand of
D
thousands of