People in China all wonder when we ______ worry about the air we breathe.
A. can’t B. needn’t C. shouldn’t D. mustn’t
Please keep ____ and never give up. One day we will realize our big dream.
A. try B. tried C. trying D. to try
“Red envelope" fever on WeChat ______ the whole country since 2015.
A. swept B. has swept C. sweeps D. will sweep
Nowadays square dance has become one of ____ exercises for the Chinese grandmas.
A. popular B. more popular C. most popular D. the most popular
The officer made his men his order at once.
A. make out B. work out C. carry out D. break out
---Which do you like better, skating or skiing?
---______of them. I like running.
A. Both B. Either C. Neither D. Each
