The books by Mo Yan are so popular that they are in great _______.
A. quantity B. progress C. production D. demand
Little _______he was saving every penny he earned in order to go to a fashion school.
A. the parents did know B. did the parents know
C. knew the parents D. the parents knew
The Shopping Festival in China falls on Nov. 11 _______millions of Chinese shoppers go to Tmall.com and Taobao.com.
A. when B. that C. which D. where
If I had been a little more careful, I _______the wallet behind.
A. won't leave B. hadn't left C. didn't leave D. wouldn't have left
Sally is always looking in the mirror, _______herself.
A. enjoying B. respecting C. admiring D. behaving
_______we are worried about is that air pollution is becoming much heavier in Han Dan.
A. It B. What C. Why D. Which
