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. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been 8. He’s given me so much help that I really want to do something for him _____. A. in returns B. by turns C. in return D. in answer 9. Don’t worry. Jim is quite used to ____ in such busy streets as this. A. drive B. be driving C. have driven D. driving 10. The visiting minister expressed his satisfaction with these talks, ____ that he had enjoyed his stay here. A. adding to B. adding up C. adding up to D. adding 11. I’m sorry to have you _____ so long. A. waited B. to wait C. waiting D. to be waiting 12. I have been living in the United States for twenty years, but seldom _____ so lonely as now. A. have I felt B. I had felt C. I have felt D. had I felt 13. Charles Babbage is generally considered _____ the first puter. A. to invent B. inventing C. to have invented D. having invented 14. His work was _____ by his boss. A. highly thought B. high thought of C.