It's a common _______ for young people to pay a New Year's visit to their elders.
#13137
A
sense
B
practice
C
rule
D
scene
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houses
#13362
A
nurses
B
horses
C
pulses
D
causes
There are   students in our schoo1.
#14414
A
three thousand
B
three thousand of
C
three thousands
D
three thousands of