Đất sét là chất khoáng chứa nhôm có trong tự nhiên.Thành phần của đất sét được biểu diễn bằng công thức Al2O3.2H2O.2SiO2.Thành phần phần trăm về khối lượng của nhôm có trong đất sét là bao nhiêu?

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các bạn đừng khoanh bậy nha -,- , mình nọp cho cô mấy lần trước sai hết rồi TT -------------- Choose the letter A, B, C or D to complete the sentences Question 1: Some Vietnamese schools make students wear Ao Dai, the __________ dress of Vietnam. A. tradition B. traditional C. traditions D. traditionally Question 2: Can you tell me what is the difference __________ custom and tradition? A. in B. of C. among D. between Question 3: Before beginning the meal, we should __________ for the oldest person to start. A. wait B. to wait C. waiting D. waited Question 4: You don’t have __________ tips for the waiters in Vietnam. A. leave B. leaving C. to leave D. left Question 5: My mother taught me some table __________ when I was young. A. manners B. unities C. prongs D. offsprings Question 6: We reached the house after __________ for almost an hour. A. cycled B. to cycle C. cycling D. cycle Question 7: Our customs are passed __________ from generations to generations. A. down B. up C. to D. over Question 8: Some fortune tellers can read your future by looking __________ your palm. A. to B. in C. at D. for Question 9: I’m so __________ about exploring customs of your country A. excited B. interested C. fond D. keen Question 10: Although I have never been to the place, it has a __________ of belonging to me. A. prong B. palm C. course D. sense Question 11: My teacher paid me a __________ because I finished all difficult tasks. A. cutlery B. compliment C. offspring D. manner Question 12: This filmstrip __________ the daily routines of a typical Vietnamese family. A. reflects B. accepts C. obliges D. sprays Question 13: He __________ try to be more punctual; or else, the manager will get angry. A. must B. should C. need D. may Question 14: He came up with the solution __________ every problems. A. in B. at C. for D. to Question 15: It’s a custom in the USA as people use __________ in all meals. A. cutleries B. offsprings C. belongings D. tips