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Cho 5 số tự nhiên bất kì . CMR trong 5 số đó : a)Tồn tại 2 số có hiệu chia hết cho 4 b)Tồn tại 3 số có tổng chia hết cho 3
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13. I have a friend who claims ____________________ (be) able to speak five languages. 14. He likes __ ___ (think) carefully about things before ____________________ (make) a decision. 15. Steve used ____________________ (be) a footballer. He had to stop ____________________ (play) because of an injury. 16. After ____________________ (stop) by the police, the man admitted ____________________ (steal) the car but denied ____________________ (drive) at 100 miles an hour. 17. How do you make this machine ____________________ (work)? ~ I’m not sure. Try ____________________ (press) that button and see what happen. 18. They don’t allow ______________________ (smoke) in the auditorium, they don’t want ____________________ (risk) ____________________ (set) it on fire. 19. Would you like me ____________________ (turn) down the radio? ~ No, it’s all right. I’m used to ____________________ (work) with the radio on. 20. I always try __________________ (come) in quietly but they always hear me ___________________ (go) up¬stairs. It’s impossible ____________________ (climb) an old wooden staircase at night without ____________________ (make) noise.

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