16-year-old students in England should understand fifteen _______ words.
#51588
A
thousand
B
thousands
C
thousand of
D
thousands of
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During the holiday, ____ people went to travel.
#51548
A
million of
B
two millions
C
millions of
D
million
The earthquake killed ____ ___ .people .
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A
thousand
B
three thousands
C
thousands of
D
three thousands of .
Li ping’s brother is an boy.
#51702
A
eighteen-years-old
B
eighteen years old
C
eighteen-year-old
D
eighteen year old