She works hard ________ she can pass the final exam.
A. since B. as if C. unless D. so that
— Driving to work used to be popular.
— That was true. But ________, more and more people go to work by bike to avoid traffic.
A. suddenly B. luckily C. widely D. lately
— If you feel warm enough, you can ________ the heater.
— OK, thanks for reminding that.
A. turn off B. take off C. put off D. get off
________ the environment, many supermarkets in China stopped providing free plastic bags.
A. To protect B. Protect C. Protects D. Protected
— ________ will you stay in China for your further study?
— For three years.
A. How often B. How soon C. How far D. How long
— ________ I watch Ode to Joy (《欢乐颂》) , on TV now, Mom?
— No, you can’t. You ________ finish your homework first.
A. May；must B. Can；need C. May；can D. Must；needn’t
