__________ trees are yellow in autumn.               
#51910
A
The number
B
A number
C
A number of
D
The number of
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_____ soldiers and doctors have been in Wenchuan to help the people there.
#51747
A
Thousand of
B
Two thousands
C
Thousands of
D
Many thousands of
There      students in our school at that time.
#50950
A
were two thousands
B
are two thousand
C
are two thousand of
D
were two thousand
I hear ________ students went to the hall to have the concert.
#51440
A
two hundred
B
two hundreds
C
hundred of
D
two hundred of
My brother is ____ years old.Today is his _____ birthday.
#51690
A
nine, nine
B
nine, ninth
C
ninth, ninth
D
ninth, nine