Cho hình chóp S.ABCD có đáy là hình vuông và tam giác SAC vuông cân tại S. Mặt phẳng (ABCD) vuông góc với: A. SA B. SD C. SB D. SO Help !

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Cho biết hình thành của châu đại dương từ đâu mà ra ?

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IV. Give the correct forms of the verbs in parentheses. 1. At 7 p.m yesterday, I ( have ) …………… dinner with my family. 2. They ( build ) ………….. this hospital since last December. 3. What ………your father ( do) …………. at this time yesterday? He ( watch ) …………TV 4. ……. They(practice) …………( rehearse ) …………a play at5p.m last Sunday? No, they …….. They ( sing ) …………….English songs. 5. I don’t think I (go)…………………………………… out tonight. I’m too tired. 6. Where……….. you (used )………(spend)……………... your summer holiday , Tam ? 7. In my country it (not rain)……………………………………… much in winter. 8. I (not know)…………………. how to dance when I (be)………... six years old. 9. My father (not like)…………………………… drinking beer but yesterday he (have)…….. two big glasses of beer because he (be)……………. happy to receive my mother’s news. 10. Last week I (send)……………. Mary a letter but she (not reply)………………since then and I (be)………………. very sad now. 11. My parents (help)……… me ( do ) ………….my homework at 8p.m yesterday. 12. Paul (be)…………. used to ( speak ) ……………… outside the class. 13. …………..you ever ( see ) ……………. Hippos? 14. Mai ( guide ) ……………….. the tourists how ( buy ) ………….. tickets in the museum at 9a.m yesterday. 15. What …………the students in class 7A ( do ) …………. at this time last Monday? can gap ak

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I Give the correct form of the word given to complete the sentence. 1. Is she_enough to run one kilometer? (GOOD) 2. “Ow! Be careful with that coffee." - “Look, now I have a_(BURNING) _on my arm” 3. Rob has a of 39.5°C(TEMPERATE) 4. Don't eat so quickly. You'll get a(TEETH) 5. I have a_ in my back. I'm going to lie down.(PAINFUL) 6. That's a bad__. Why don't you have a glass of water? (COUGHING) 7. “I have _ _.” - “Why don't you telephone the doctor?” (STOMACH) 8. My arm _after the table tennis match(HURT) 9. "I have a.” - "That's because you watch too (HEAD) much TV.” 10. Lan was absent from class because of her(SICK) 11. I have an - with my doctor at 5p.m.(APPOINT) 12. She is still receiving a__treatment in a hospital. (MEDICINE) 13. People fellwhen they catch a common cold. (PLEASE) 14. She's to seafood. So when she eats them, she will (ALLERGY) have stomachache problems. 15. You should choose foods and drinks to prevent (CARE) some dangerous diseases. 16. He continues _because he is catching a flu.(SNEEZE) 17. He can reduce his serious when he relaxes in time and (DEPRESS) does exercise regularly. 18. If you provide yourself with enough vitamins, you will make (CONCENTRATE) a better on your work or study. 19. I got _during my beach vacation.(SUNBURN) 20. Lack of vitamin E can cause skin diseases and(TIRED)