On National Day there are more than four     people in the park.
#51600
A
thousand
B
thousands
C
thousands of
D
thousand of
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 ___________ 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
They have made so great progress      .
#51890
A
three years ago
B
for three years
C
in the past three years
D
before three years
    girls took part in the Happy Girl Competition but only few of them succeeded.
#51897
A
Million of
B
Many million of
C
One million of
D
Millions of
Two ______ trees have been planted along the lake since 1998.
#51883
A
thousands of
B
thousand of
C
thousands
D
thousand