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C. forming D. having formed3. The man insisted ________ a taxi for me even though I told him I lived nearby.A. find B. to find C. on finding D. in finding4. The old man, _____ abroad for twenty years, is on the way back to his motherland.A. to work B. working C. to have worked D. having worked5. You were silly not ________ your car.A. to lock B. to have locked C. locking D. having locked6. Don’t leave the water ________ while you brush your teeth.A. run B. running C. being run D. to run7. When flint ________ to the market, these products enjoyed great success.A. introducing B. introduced C. introduce D. being introduced8. “We can’t go out in this weather,” said Bob, ________ out of the window.A. looking B. to look C. looked D. having looked9. My advisor encouraged ________ a summer course to improve my writing skills.A. for me taking B. me taking C. for me to take D. me to take10. ________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.A. To wait B. Have waited C. Having waited D. To have waited11. Linda worked for the Minnesota Manufacturing and Mining Company, ________ as 3M.A. knowing B. known C. being known D. to be known12. Sarah, hurry up. I’m afraid you can’t have time to ________ before the party.A. get changed B. get change C. get changing D. get to change13. ______ by the beauty of nature, the girl from London decided to stay another two days off the farm.A. Attracting B. Attracted C. To be attracted D. Having attracted14. I don’t know whether you happen ________ , but I’m going to study in the U. S. t