31.If the machine _______, press this button. A.stop B. stops C. would stop D. stopped 32. Rachel will be pleased _________ she passes her driving test. A.should B. will C. if D. unless 33.You can use my car ___________ you drive carefully. A.unless B. as long as C. as soon as D. when 34. If you help me with this exercise, I ________do the same for you one day. A.will B. would C. was D. am 35.The bus won’t stop __________ you ring the bell. A.if B. as soon as C. providing D. unless 36.I didn’t get home until after midnight last night. Otherwise, I _____ your call. A.returned B. had returned C.would return D. would have returned 37.”What a beautiful dress you’re wearing!” “Thank you. It_____ especially for me by a French tailor”. A.is made B. has made C. made D. was made 38.Gold_____ in California in the nineteenth century. A.was discovered B. has been discovered C.was discover D. they discovered 39. They said that they had been driving through the desert__________. A. the previous day B. yesterday C. the last day D. Sunday previously 40. He wanted to know whether I ___________ back tomorrow. A. come B. came C. will come D. would come