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heimi219
2 năm trước
Cho A(−1;−2;4);B(−4;−2;0);C(3;−2;1) và D(1;1;1). Độ dài đường cao của tứ diện ABCD kẻ từ đỉnh D là:
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2. I’m busy right now, so I can’t help you.  I could..................................................................... 3. He’s very thin, that’s why he feels the cold so much.  If he........................................................................... 4. If you don’t like this one, I’ll bring you another. Unless.......................................................................... 5. I’ll only help you if you promise to try harder.  Unless........................................................................ 6. If she doesn’t work harder, she’ll lose her job.  She’ll....................................................................... 7. You drink too much coffee, that’s why you can’t sleep.  If you...................................................................... 8. Make me some coffee, and I’ll give you one of my biscuits.  If................................................................................................. 9. He doesn’t have the money and he cannot afford a new car.  If........................................................................................ 10. I cannot go to the beach with you this weekend because I have a date with my old classmates.  If. 11. The match can be cancelled because it rains heavily.  If...........................................................................

VI. Choose the correct sentence from the four options a, b, c or d 31 "Jean, have you seen my gloves?" Tom asked a. Tom asked Jean whether/if she had seen his gloves. b. Tom asked Jean whether/if had you seen his gloves. c. Tom asked Jean whether/if had she seen his gloves. d. Tom asked Jean whether if she had seen her gloves. 32 “Don't leave the window open, Ann", I said a. I told Ann does not leave the window open. b. I told Ann not to leave the window open. c. I told Ann to leave the window open. d. I told Ann not leave the window open. 33 "I'll have a cup of coffee with you," she said a. She said that she have a cup of coffee with me. b. She said that she had a cup of coffee with me. c. She said that she would have a cup of coffee with me. d. She said that she would have a cup of coffee with you. 34 “I’ll pay him if can" she said a. She said that she will pay him if she could b. She said that I would pay him if I could c. She said that she would pay him if she could d. She said that she would pay him if she can. 35 “What are you going to do next summer?" she asked a. She asked us what we were going to do the following summer. b. She asked us what I was going to do the following summer. c. She asked us what were we going to do the following summer. d. She asked us what we was going to do the following summer. 36 “I’ll phone you tomorrow," he told Jack. a. He told Jack that I would phone him the following day. b. He told Jack that I will phone him the following. c. He told Jack that he would phone him tomorrow. d. He told Jack that he would phone him the following day. 37 "Can I sit beside you, Jean?" Tom asked a. Tom asked Jean whether/if I could sit beside her. b. Tom asked Jean whether/if could he sit beside her. c. Tom asked Jean whether / if he could sit beside her. d. Tom asked Jean whether/if he could sit beside you. 38 "I want a bike for my birthday," he said. a. He said that he wanted a bike for his birthday. b. He said that I wanted a bike for his birthday. c. He said that he wants a bike for his birthday. d. He said that he wanted a bike for my birthday. 39 "Don't keep the door locked," he said to us. a. He told us not to keep the door locked b. He told us do not keep the door locked c. He told us not keep the door locked d. He told us to not keep the door locked 40 “How long are you going to stay?" I asked him. a. I asked him how long I was going to stay. b. I asked him how long you were going to stay. c. I asked him how long were you going to stay. d. I asked him how long he was going to stay. VII. Choose the word or phrase (A, B, c or D) that best fits the blank space in the following passage? Why does Man want to go to other planets (41) ........ the solar system? Just for adventure? True, (42) ........ is adventure in space travel. But a (43) ........ to other planets would also be (44) ........ . For example, space stations could be built that would give us (45) ........ information about the weather. \n In space stations (46) ........ around the earth, Man could live and study the cloud formations on (47) ........ surface. These formations could tell us what weather to (48) ........ in any part of the world at any time. (49) ........ information would be useful to pilots, to ship captains, and even to farmers (50) ........ must set dates for planting and harvesting. \n 41a. on b. in c. at d. of 42a. there b. this c. that d. it 43a. travel b. fly c. trip d. drive 44a. practice b. practised c. practising d. practical 45a. valuable b. wealthy c. expensive d. amused 46a. moves b. moving c. moved d. moveable 47a. his b. her c. its d. their 48a. hope b. believe c. expect d. consider 49a. These b. Those c. So d. Such 50a. which b. who c. whom d. whose

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