—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
Jack，please________ the lights to save electricity.
A. turn off B. turn on C. turn up D. turn down
The box is used to collect waste which can be ________，such as plastic bottles and paper.
A. reported B. repaired C. recycled D. reviewed
Many young people took part in trees on Tree Planting Day.
A. planting B. plants
C. to plant D. plant
