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–How many students are there in the classroom?

-__________. They are all in the lab.

A. Some　　　　 B. None　　　　　 C. All　　　　　 D. Neither

—How many students are there in your school?
—_______ students, I think.
A. Three thousands
B. Three thousand
C.Three thousands of

-----How many students are there in the classroom?------_______.

---How many students have visited Yangzhou Museum?  
---____

—How many students do you think are still on the playground now?
—I am afraid there are few of them, ______?