_______ of the materials I listened to at the beginning of the exam _______ easy.

----What did you see on the large farm last Sunday?
----Oh, I saw about three ________ hens and _________ of eggs.

______ of the floor _______ wet.

Tom lives on the ________ floor.
A. two B. twice    C. second

—How many birds can you see in the trees?
—I can see        birds in them.

Our teacher said there would be ______ books in the new library.

    the students in this school is about four thousand,      of them are boys．

---The number of the students in our school is about nine _____.   ---I see. ______of them are boys.

There are_______ seasons in a year． Winter is_________season．

There are _____________ doctors and nurses in that hospital.