Biết x:(-2) 5 = (-2) 3 . Kết quả x bằng: A. 2 8 B. 4 C. (- 2) 15 D. (- 27 ) 7

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Ex2: Fill in each blank with the correct preposition. 1. The price of electricity is going up _______________ August. 2. They came to visit us _______________ my birthday. 3. Did you have a good time _______________ Christmas? 4. The children are really excited _______________ their summer vacation. 5. I haven’t seen Liz _____________ Monday 6. John missed a lot of lessons. He was ill _______________ January to March. 7. The course begins _____________ January 2005 and ends sometimes __________ April. 8. My cat is very fond _______________ fish. 9. The course begins ____________ 7th January and ends _______ May. 10. There are usually a lot of parties _________ New Year’s Day. 11. We're having a party _______________ New Year's Eve. Can you come? - I'm afraid I can't. I don't like going out _______________ night. 12. I always come __________ school _____________ foot. 13. He had learned the whole poem _______________ heart. 14. He’s not very keen _______________ watching football, but his wife is. 15. Are you worried _______________ the final examination? 16. Sandra often goes to church _______________5 o'clock _______________Sundays. 17. Bill has worked in this company _______________ five years _______________he graduated from Yale University _______________ 1998. 18. The office will be closed _______________ Christmas and New Year. It will be open _______________January 5th. 19. It's rained _______________ the night _______________two or three hours. 20. We are always proud __________________ your success.