They ________ many buildings in the last five years.
A. build B. have built C. built D. are building
Our government has to do something ________ our environment.
A. protect B. protected C. protecting D. to protect
Anyone who sings well can the activity in our school.
A. take part in B. take off C. take out D. take care of
—Why don't you buy the computer?
—It's too expensive. I can't ________ it.
A. afford B. sell C. borrow D. keep
In order to protect the environment，we should stop ________ in cars.
A. to ride B. to riding C. riding D. ride
—The house is too old and dangerous.
— Yes. We should ________ soon.
A. pull down it B. put out it C. pull it down D. put it out
