There were          different kinds of dinosaurs in the word in the past.
A．hundred ofB．two hundred ofC．hundreds ofD．two hundreds of
Each of us has to write a ______ report every two weeks.
A. two-hundred-word  B. two-hundreds-word  C. two-hundred-words      
–We ‘ll be back for our school’s _____anniversary (周年) ceremony .
-I see. That means you’ll have a get-together with your classmates in ____years .
A．twelve; sevenB．twelfth; sevenC．twelve seventhD．twelfth; seventh
--- how was your weekend?
---- Great! It was my grandfather’s _______ birthday. We enjoyed ourselves.
A．seventyB．seventiethC． the seventiethD．seventeenth
I'm 13 years old and my sister is 15 years old. So my sister is
A．oneB．twoC．threeD．four
—How often do the students play sports?
A．Twice a dayB．Since last nightC．For two hoursD．A month ago
How do you read 15,847?
A．fifteen thousand, eight hundred and forty-seven
B．fifteen thousands, eight hundreds and forty seven
C．fifteen thousand, eight hundred and forty seven
D．fifteen thousand and eight hundred and forty-seven
---What is ______ month of the year ? ---It’s December .
A．the twelveB．twelveC．twelfthD．the twelfth
Nowadays            of business letters are written in English.？ 
A．two-thirdB．two-thirdsC．two-threeD．two-threes
We still enjoyed ourselves on the Great Wall -----there were------ people during the holiday.
A．though; hundredB．however; two hundreds
C．but; hundreds ofD．although; hundreds of
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