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a) tính hóa trị của Al trong AlPO4 b) sửa lại CTHH sai HCO3, H2PO4, HCl, H2NO3, HSO4
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VI. Mark the letter A, B, C or D in your answer sheet to choose the sentence which is closest in meaning to the given one. 91. The children couldn't go swimming because the sea was too rough. A. The sea was too rough for the children to go swimming. B. The sea was rough enough for the children to swim in. C. The sea was too rough to the children's swimming. D. The children were not calm enough to swim in the sea. 92. No one has seen Linda since the day of the party. A. Linda has not been seen since the day of the party. B. Linda is nowhere to be seen at the party. C. The party is going on without Linda. D. No one has seen Linda for ages. 93. He talked about nothing except the weather. A. He talked about everything including weather. B. His sole topic of conversation was the weather. C. He had nothing to say about the weather. D. He said he had no interest in the weather. 94. He doesn‟t study hard, so he can fail the exam. A. If he studies hard, he won‟t fail the exam. B. If ha didn‟t study hard, he wouldn‟t fail the exam. C. If he studied hard, he wouldn‟t fail the exam. D. If he hadn‟t studied hard, he wouldn‟t have failed the exam. 95: It is possible that the fire in the ship was started by a bomb. A. They say that a bomb started the fire in the ship. B. The fire in the ship might have been started by a bomb. C. It shall be said the fire in the ship had been started by a bomb. D. The fire in the ship is known to have been started by a bomb. 96: Neil always forgets his wife‟s birthday. A. At no time Neil remembers his wife‟s birthday. B. Neil never remembers his wife‟s birthday. C. Neil sometimes remembers his wife‟s birthday. D. Neil remembers his wife‟s birthday all the time. 97. “ If I were you, I would take a break.”, Tom said to Daisy. A. Tom told Daisy he would have taken a break if he had been her. B. Tom advised Daisy he would take a break if he were her. C. Tom advised Daisy to take a break. D. Tom advised Daisy to take a break if he were her. 98. John wishes he had remembered to send Mary a Christmas card. A. John regrets to send Mary a Christmas card. B. John regrets forgetting not to send Mary a Christmas card. C. John regrets not remembering sending Mary a Christmas card. D. John regrets forgetting to send Mary a Christmas card. 99: In spite of his poverty, he led a devoted life to the revolutionary cause. A. He could not devote his life to the revolutionary cause because of his poverty. B. If he had not been so poor, he could have devoted his life to the revolutionary cause. C. Poor as he was, he led a devoted life to the revolutionary cause. D. He led a devoted life to the revolutionary cause, but he was so poor. 100: I thought I shouldn‟t have stayed at home yesterday. A. I regretted staying at home yesterday. B. I regretted for staying at home yesterday. C. I regret for staying at home yesterday. D. I regret to stay at home yesterday.

II/ Choose the best answer:(1) 11. It is very dangerous …. in the polluted environment.A. to live B. lives C. living D. live 12. Our ………….. resources are limited so we should recycle all used things. A. nature B. natural C. naturing D. naturally 13. His car is the same color …. my uncle’s.A. alike B. as C. like D. to 14. This ruler ….. of plastic. A. make B. made C. is making D. is made 15. I take part ….. most youth activities of my school.A. in B. of C. on D. at 16. My mother enjoys_________ traditional food for our family, especially at Tet holiday. A. cook B. to cook C. cooking D. cooked 17. My father sometimes goes _____ in the forests.He’d like to findsome more food for our family. A. hunt B. hunting C. to hunt D. hunted 18. Look! Some children are ____________the buffaloes. A. picking B. herding C. driving D. playing 19. The sky is _______here in the countryside because there are no buildings to block the view. A. tidy B. close C. dense D. vast 20.Is living in the city _________ than living in the country? A. more convenient B. as convenient C. most convenient D. so convenient

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