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The river is very long and it is about      .

Eight         students in our school are from countryside.
A  hundreds    B  hundred   C hundreds of   D   hundred of

—If a="4," b="5," what’s the answer to the question “ a + 2ab +1 =?”
?   —     .
?

The government of Chongqing is building ________ cheap and good houses for the people.

All the visitors live on    floor.
A. two                     B. second              C. the second

—Jackie Chan has donated     dollars to  charity.?
—He is an example to us all.?

—They have built another new library for the students
—About_____ of the books in their library are written in English．

_____ the fans are waiting for the popular singer outside the concert hall.

____________ people went to the concert which was held in People’s Square the night of May Day.

Each of us has to write a ________ report every two weeks．