Hàm số nào sau đây liên tục trên toàn bộ tập số thực A;y=tanx B;y=x-1/2x+1 C;y=x ² -3x+56 D;y=1/x ²-2

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Exercise 1: Nèi hai c©u thµnh mét c©u sö dông ®¹i tõ, tr¹ng tõ quan hÖ 1/ The student is from China. He sits next to me. - …………………………………………………………….. 2/ I thanked the woman. This woman had helped me. - …………………………………………………………….. 3/ The professor is excellent. I am taking his course. - …………………………………………………………….. 4/ I recently went back to Paris. It is still as beautiful as a pearl. - …………………………………………………………….. 5/ Nam knows the man. We talked to him this morning. - …………………………………………………………….. 6/ The house is very old. My grandfather used to live there. - …………………………………………………………….. 7. The girl looked like my mother. I talked to her yesterday. - ……………………………………………………………………… 8. The job is interesting. I applied for it last month. - ………………………………………………………………… 9. The meeting lasted five hours. I went to it yesterday. - ………………………………………………………………… 10. This is my best colleague. I told you about him last time. - …………………………………………………………………… 11. The house was ruined last month. They had live in it for ten years. - …………………………………………………………………… 12. She showed me a photograph of her son. He is a doctor. - ……………………………………………………………………… 13. The sea looks rather dirty. We decided not to swim in it. - ……………………………………………………………………… 14. The new stadium will be built next month. It can hold 9.000 people. - ……………………………………………………………………… 15. The doctor told me to rest for a few days. I went to see him last week. - ……………………………………………………………………… 16. A friend of mine helped me get a job. His father is the manager of a company. - ………………………………………………………………… 17. We spent a pleasant day by the lake. We had a picnic by the lake. - …………………………………………………………………………… 18. The teacher asked us the question. Do you understand it? - …………………………………………………………………………… 19. Next week I’m going to Paris. My wife works in Paris. - ……………………………………………………………………………… 20. London has a great clock- Big Ben. We visited London last summer.