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__________. A. clean B. cleaned C .to clean D. cleaning 14. Jack said that he wouldn39。t mind ___________ for us. A. to wait B. wait C. waiting D. waited 15. My brother keeps _________ me with my work. A. to help B. help C. helping D. helped should often practise _________ English with each other. A. to speak B. spoke C. speak D. speaking on _________ and you will succeed. A. a try B. try C. triing D. trying parents insist on ____________ to college. A. he should go B. he go C. his going D. him to go story was so funny that we ___________. A. couldn39。t help laugh B. can39。t but laugh C. couldn39。t help laughing D. couldn39。t help but to laugh about _________ to the concert with us ? A. we go B. we going C. going D. to go clean is a safeguard against disease. A. To be keeping B. Kept C. Keep D. Keeping is _________. A. to believe B. believing C. believed D. being believed23.The scientist suggested ____ the experiment in a different way. A. do B. to do C. doing D. done24.Don39。t forget _____ this book to John when you see him. A. to return B. returning C. return D. to returning25.Only one of these books is _____. A. worth to read B. worth being read C. worth of reading D. worth reading26.We are both looking forward to _____ next week. A. going on vacation B. go on vacation C. be going on vacation D. have gone on vacation27.He had no difficulty _____ the problems. A. working out B. having worked out C. to have worked out D. to work out28.I regretted _____ that to her. A. having said B. to have said C. to say D. /29. The secretary worked late into the night , ________ a long speech for the president . A. to prepare B. preparing C. prepared D. was preparing30. Don’t have the machine ________ all the time . It will go wrong . A. to run B. running C. been run D. run31. The food was delicious . That was a __________ meal . A. satisfying B. satisfied C. satisfaction D. satisfy32. Look around when __________ the street . A. across B. crossing C. crossed D. to be crossing33. In the morning she found her father _____________ in bed , dead . A. lying B. lie C. lay D. laying34. I saw him ________ into your room when you were not in. A. gone B. going C. went D. to go 35. Please keep quiet. Father is busy ________. A. work B. to work C. working D. works36. Sally had no pen ____ yesterday morning. A. to write B. to write with C. writing D. writing with37. It’s time for class. Stop _________, please. A. to talk B. talk C. talks D. talking 38. You should work tonight instead of ________ TV. A. to watch B. watching C. to watching D. watched 39. Listen! Can you hear the girl _________ the piano in the next room? A. to play B. play C. playing D. plays40. Mr. Wang came into the office without _________ the door. A. knock B. knocking at C. to knock at D. knocking to 實(shí)戰(zhàn)演練(三)1. Paul doesn’t have to be made _______. He always works hard.A. learn B. to le