I. Choose A, B, C or D to complete the following sentences: (3 pts) 1. UFOs mean ____ flying objects. A. unknown B. unidentified C. unable D. unimaginary 2. Some scientists say that flying saucers might be people’s_______. A. imagination B. imagine C. imaginative D. imaginary 3. Imagine someday you would live without_______. A. electricity B. electric : thuộc về điện học C. electrician : kỹ sư điện D. electrical : thuộc về điện 4. We leave _______ 28th May. A. in B. on C. at D. of 5. _______I speak to Mai, please? A. Must B. Ought C. Have D. Could 6. The disease was thought to have _______in Africa. A. disappeared B. disappearing C. appeared D. appearing 7. The man _______ without traces : dấu vết. A. disappeared B. disappearing C. appeared D. appearing 8. We _______ her since we left school. A. haven’t met B. don’t meet C. didn’t meet D. won’t meet 9. If you have_______ money, you can travel abroad this summer. A. many B. a lots C. a lot of D. lot of 10. Neil Armstrong, _______walked on the moon, lived in the USA. A. who B. that C. whose D. which 11. It snowed in Lang Son _______ the winter_______ 2002. A. of-in B. at-for C. or-at D. in-of 12. I wish they _______ here tomorrow. A. come B. will come C. came D. would come