There’re so many kinds of tape-recorders on sale that I can’t make up my mind _____ to buy. A. what B. which C. how D. where 17. There isn’t any difference between the two. I really don’t know _________. A. where to choose B. which to choose C. to choose what D. to choose which 18. “ Have you decided when ________?” “ Yes, tomorrow morning.” A. to leave B. to be leaving C. will you leave D. are you leaving 19. Last summer I took a course on ________. A. how to make dresses B. how dresses be made C. how to be made dresses D. how dresses to be made 20. He doesn’t know ______ to stay or not. A. whether B. if C. either D. if he will 21. She pretended _______ me when I passed by. A. not to see B. not seeing C. to not see D. having not seen 22. --- The light in the office is still on. --- Oh, I forgot _______. A. turning it off B. turn it off C. to turn it off D. having turned it off 23. We agreed _________ here but so far she hasn’t turned up yet. A. having met B. meeting C. to meet D. to have met 24. Little Jim should love _______ to the theatre this evening. A. to be taken B. to take C. being taken D. taking 25. I would love ______ to the party last night but I had to work extra hours to finish a report. A. to go B. to have gone C. going D. having gone 26. Frank is the kind of person who people like to ________. A. make friend with B. make friends of C. make friends D. make friends with 27. Go on ________ the other exercise after you have finished this one. A. to do B. doing C. with D. to be doing 28. She reached the top of the hill and stopped _______ on a big rock by the side of the path. A. to have rested B. resting C. to rest D. rest 29. Tom kept quiet about the accident ________ lose his job. A. so not as to B. so as not to C. so as to not D. not so as to 30. I need a day or two ________. A. to think it over B. to think over C. of thinking