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ee C. be seen D. can39。t see 5. Some people think trees _____ on Tree Planting Day only. A. should be planted B. should plant C. should be planting D. be planted 6. Personal puters _____in 1976. It has changed the whole world A. have been invented B. are invented C. were invented D. invented 7. — Do you know who designed the CDROM Around the world in Eight Hours? — Yes. It ______ by Nancy Jackson. A. has designed B. designed C. was designed D. designs 8. The window______ ten minutes ago, and the room is bright now. A. can be cleaned B. is cleaned C. was cleaned D. will be cleaned 9. This kind of food_____ cool, clean and dry according to the instruction. A. should be carried B. must be put C. should be placed D. must be kept 10. — Where did you go last night? — I_____ to go to Li Lei39。ts would be held soon. A. talked B. spoken C. told D. said 16. Children shouldn’t______ to drive. A. allow B. be allowing C. be allowed D. to allow 17. I know she won39