There are_________ students in my school._________ students in my school is over 5000.

--How many birds can you see in the tree?
--I can see    birds in the tree.      

More than five __________ people went to the concert last night.
A. thousand         B. thousands            C. thousands of

Jack’s mother was twenty-seven when he was born. Jack is eleven this year. How old is his mother?

Tibet has been a part of China since _________ years ago.

－He buys __________ books, but he doesn’t read them at all.

.I think _________ of the materials I listened to at the beginning of the exam ____ easy.

--What’s three and two? --It’s________．

My mother buys _________ for me on my birthday .
A. a pairs of jeans          B. a pair of jeans         C. a pair of jean

Seven _________ workers work in that factory.
A. thousands of          B. thousands          C. thousand