20.When you cross the road, be careful of ______. A. traffics B. the traffics C. a traffic D. the traffic ...

14.Henan had a larger population ______ in China. A. than any province B. than all the other provinces C. than other province D. than all the provinces ...

8.He was very rude to the customs officer, ____ of course made things even worse. A. who B. whom C. what D. which ...

2.Can those___ at the back of the classroom hear me ------- No problem. A. seat B. sitted C. seated D. sat ...

16.____all the inventions have in common is ____they have succeeded. A. What/ what B. That/ that C. what/that D. That/ what ...

10.___ you did it is not known to all. A. Who B. What C. How D. Which ...

4.The manager came over and asked the customer how____ A. did the quarrel came about B. the quarrel had come about C. had the quarrel come about D. had the quarrel come about ...

18.I regret _____ hard at school, or I would have succeeded in passing the exam. A. not to work B. having not worked C. to have not worked D. not having worked ...

12.He looked around and caught a man _____ his hand into the pocket of a passenger. A. put B. to be putting C. to put D. putting ...

6.--- Did you get a dictionary --- No, I _____, but there were not any _____. A. tried/to be left B. had tried to/ leaving C. tried to/ left D. had tried/have left ...