từ cthh của chất sau ca3(po4)2 hãy cho biết a,nguyên tố nào tạo ra chất b,Số nguyên tử của mỗi nguyên tố có trong 1 phân tử chất c,Tính PTK của chất

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II. 8. This form must have the ……………. of the writer. A. to sign B. signature C. signing D. sign. 9. Jane and Jack stood in front of the mirror and looked at ........................ . A. herself B. himself C.theirselves D. themselves 10. Susan is the ........................... of the three girls. A. prettier B. prettiest C. pretty D. prettily 11. ......................the beginning of the day called morning or evening? A. Is B. Are C. Does D.Can 12. Nam ................... familiar with getting up early in winter two years ago. A. was B. were C. is D. has been 13.The school yard was..................... with students. A. crowd B. crowds C. crowded D. crowding 14. These are new born.......................of our farm. A. calf B. calves C. calfes D. calfs 15. My father always drives.......................... He is a ...................... driver. A. carefully - careful B. carefully - carefully C. carefully – care D. careful – carefully 16. Unless you work hard, you………..fail the exams. A. won’t fail B. will fail C. don’t fail D. didn’t fail 17. Mr Minh used to ………….alot when he was young. A. smoke B. smoking C. smoked D.be smoking 18. Minh drew that picture…………. . No one helped him. A. himself B. heself C. hisself D. Minh’s self 19. Why are you turning on the TV ? I ………..the news. A. will watch B. am going to watch C. watch D. watched 20. Hung is …………. to ride motobike to school. A. not old enough B. old not enough C. enough old not D. enough not old 21. We have learned English ………. nearly three years. A. since B. for C. in D. in 22. Tom failed the exam ……………. his laziness. A. so B. because C. because of D. instead of 23. I told him ………… so much candy. A. not to eat B. don’t eat C. to not eat D. to eat not 24. Nam dosen’t watch T.V .................... often as his brother A. so B. like C. such D. too 25.Nhung is ............................ with being a famous star. A. boring B. boredom C. bored D. to bore 26. The show last night was so ........................... that we saw it through A. fascinating B. fascinated C. boring D. excited 27. Their family had a few .................... rest after a long trip A. hours B. hour’s C. hours’ D. hour 28. Either I or Tom ………….beef. A. doesn’t like B. don’t like C. like D. likes 29. When I called her, she………… a bath. A. had B. was having C. has D. is having 30. I am looking forward to ………… you. A. see B. seeing C. be seeing D. be seen 31. What…………when I called you? A. were you doing B. did you do C. are you doing D. do you do 32. I’d rather you………..at home tonight. A. stay B. stayed C. to stay D. staying 33. It was raining………we cancelled the trip to Halong Bay last Sunday. A. although B. because C. so D. but 34. She spends fifteen minutes………..to school. A. to walk B. walking C.walk D. walked 35. She hasn’t written to me………. A. already B. never C. no longer D. yet