—It's difficult to get to the other side of the river.
—I think a bridge ________ over the river.
A．should be built B．should build
C．will build D．has built
— Do you know in ancient China?
— I have no idea. But I know people once used tree leaves to make paper.
A. how paper was made B. how was paper made
C. what paper was made D. what was paper made
— Do you often go swimming_____ Sunday mornings?
— Yes. Why not _____with me this Sunday?
A. on, go B. in; to go
C. on; going D. in going
— I’d like to get some flowers for Linda’s birthday.
— Flowers are too common. you get something special?
A. What about B. Why not
C. Why don’t D. What if
It become much _______ to provide enough energy for a big city with large population.
A. difficult B. more difficult
C. most difficult D. easy
Each of us has to write a _____ report every two weeks.
A. two-hundred-word B. two-hundreds-word
C. two-hundreds-words D. two-hundred-words
