22. There are five pairs _________, but I’m at a loss which to buy.

A. to be chosen　 B. to choose from　　　　

C. to choose　　　　 D. for choosing

21. _______ your composition carefully, some spelling mistakes can be avoided.

A. Having checked　　　 B. Check　　

C. If you check　 D. To check

20. All her time _______ experiments, she has no time for films.

A. devoted to do B. devoted to doing

C. devoting to doing　　 D. is devoted to doing

19. 　All the preparations for the project ______, and we’re ready to start.

A. completed　　　 　 B. have been completed

C. had been completed D. been completed

18. The boss insisted that every minute ______ made full use of ______ the work well.

A. be, to do　　　　 B. was, doing

C. be, doing　　　　 D. was, to do

17. -Hi, Tom, let’s go to play table tennis now. OK?

-Sorry, I have a lot of work ______.

A. to do　　 B. to be done　　　 C. doing　　 D. done

16. Five years later, her father was missing, ______.

A. he was never seen again　　 B. and never found again

C. never to be found again　　 D. he was never to be seen again

15. _________ this report _________ in such a short time was quite a difficult exercise.

A. Getting, done B. Get, done　　　　 C. To get, to do　 D. Getting, to do

14. After describing the planned improvements, she went on _________ how much they would cost.

A. to explain　　　 B. explaining　　　 C. to be explaining　　　　 D. having explained

13. She took her son, ran out of the house, _________ him in the car and drove quickly to the nearest doctor’s office.

A. put　　　　 B. to put　　 C. putting　 D. having put