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words and expressions and you will find it easier to read and municate.A. Know B. Knowing C. To know D. Known17. 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 take 18. _____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 waited19. When first _____to the market ,these products enjoyed great success.A. introducing B. introduced C. introduce D. being introduced20. “We can’t go out in this weather,” said Bob,_____ out of the window.A. looking B. introduced C. introduce D. being introduced21. Don’t leave the water _____while you brush your teeth.A. run B. running C. being run D. to run22. Helen had to shout _____above the sound of the music.A. making herself hearing B. to make herself hearing C. making herself heard D. to make herself heard23. 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 worked24. Reading is an experience quite different from watching TV。 there are pictures_____ in your mind instead of before your eyes.A. to form B. form C. forming D. having formed25. Linda worked for the Minnesota Manufacturing and Mining Company, _____as 3 M.A. knowing B. known C. being known D. to be known 26. –I’ve never seen anyone run so fast. _____David go.A. Just watch B. Just to watch C. Just watching D. Just having watched27. Having been attacked by terrorists ,______.A. doctor came to their rescue B. the tall building collapsedC. an emergency measure was taken D. warnings were given to tourists28. _____with the size of the whole earth ,the biggest ocean does not seem big at all.A. Compare B. When paring C. Comparing D. When pared29. You were silly not _____your car.A. to lock B. to have locked C. locking D. having locked30. I’m going to the supermarket this afternoon. Do you have anything _____?A. to be buying B. to buy C. for buying D. bought 31. The pilot asked all the passengers on board to remain______ as the plane was making a landing.A. seat B. seating C. seated D. to be seating 32. Victor apologized for _____to inform me of the change in the plan.A. his being not able B. him not to be able C. his not being