It is said that ____ young people may lose the abilities to hear after five years if they listen to MP4 players which are too loud for more than five hours a week.
#51491
A
thousand of
B
six thousands
C
thousands of
D
six thousands of
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There're            students in Grade7. 
#51655
A
three hundreds
B
three hundreds of
C
three hundreds'
D
hundreds of
He lives on ________ floor in that building.
#51689
A
three
B
third
C
the third
D
the three
_________of people will visit Beihai .
#51811
A
Thousand
B
Thousands
C
Thousands of
D
Thousand of