_________ should not be allowed to go out at night. 
#51907
A
Twelve-years-old
B
Twelve-year-olds
C
Twelveyearold
D
Twelveyearsolds
推荐题目
There are_________ students in my school._________ students in my school is over 5000.
#51675
A
a number of, A number of
B
the number of, The number of
C
the number of, A number of
D
a number of, The number of,
The bridge is about ___meters long.
#51592
A
two hundreds
B
two hundreds of
C
two hundreds
D
two hundred
Elvis Presley has sold more than one           records all his life.
#51630
A
billion
B
billion of
C
billions of
D
Billions