Câu 17: Để loại bỏ khí CO2có lẫn trong hỗn hợp (O2; CO2). Người ta cho hỗn hợp đi qua dung dịch chứa:A. HCl B. Na2SO4C. NaCl D. Ca(OH)2.Câu 18: Nhỏ một giọt quỳ tím vào dung dịch NaOH, dung dịch có màu xanh; nhỏ từ từ dung dịch HCl cho tới dư, vào dung dịch có màu xanh trên thì.A. Màu xanh vẫn không thay đổi. B. Màu xanh nhạt dần rồi mất hẳn.C. Màu xanh nhạt dần rồi mất hẳn, rồi chuyển sanh màuđỏ D. Màu xanh đậm thêm dần. Câu 19. Có hai lọ đựng dung dịch bazơ NaOH và Ca(OH)2. Chất dùng để phân biệt hai chất trên: A. Na2CO3B. NaCl C. MgO D. HCl .Câu 20..Dãy oxit tác dụng được với nước làA.K2O; CuO; P2O5; SO2B. K2O; Na2O; MgO; Fe2O3C.K2O; BaO; N2O5; CO2D.SO2; MgO; Fe2O3; Na2O Câu 21 .Dùng thuốc thử để phân biệt ba dung dịch không màu là HCl; H2SO4; BaCl2:A nước B.quỳ tím C. ddBaCl2D.CuCâu 22: Dãy chất bazo làm đổi màu quỳ tím thành màu xanhA.NaOH; Fe(OH)3; Cu(OH)2B.KOH; Mg(OH)2; Ba(OH)2; Al(OH)3C. NaOH; Ba(OH)2; KOH D.Fe(OH)3;Cu(OH)2; Mg(OH)2;KOH Câu 23:Để hòa tan hoàn toàn 1,3g kẽm thì cần 14,7g dung dịch H2SO420%. Khi phản ứng kết thúc khối lượng hiđro thu được là:A. 0,03g B. 0,04g C. 0,05gD. 0,06gCâu 24: Cho 10,5 gam hỗn hợp hai kim loại Zn, Cu vào dung dịch H2SO4loãng dư, thu được 2,24 lít khí(đktc). Phần trăm theo khối lượng mỗi kim loại trong hỗn hợp ban đầu là:A. 61,9% và 38,1%B. 50% và 50%C. 40% và 60%D. 30% và70%

IV. PREPOSITIONS AND PARTICLES

1. It was very nice _________________ you to prepare and serve meals for the homeless.

2. He was very nice _________________ me. He was willing to take care ___________ my house while I was away.

3. “I’ve bought the Christmas tree you wanted.” – “Oh, thanks – that’s really kind ________ you .

4. Should you be kind _____________ him? He will forget your kindness __________ him.

5. Please be considerate _______________ your next-door neighbors. Never turn the TV up after midnight.

6. It was very considerate _______________ him to send her mother a bouquet of flowers ____________ Mother’s Day.

7. Many people decorate their homes ____________ Christmas. They buy Christmas trees and decorate them _________________ electric lights and ornaments.

8. Children believe that a fat, jolly man brings gifts____________ Christmas Eve. ________ Christmas morning, they look under the Christmas tree or in their stockings ______________ gifts ________________ him.

9. _____________________ Christmas Day, Christians go to church and sing joyful songs.

10. The shops are always crowded ___________________ Christmastime.

11. Would you like to go to Paris with us ____________________ Christmas today?

12. By tradition, people send greetings cards to their relatives and friends ____________ Tet. 13. Tet Trung Thu or the Mid-Autumn Festival is celebrated every year _________________ August 15th.

14. Passover is celebrated _________________ late March or early April.

15. Vietnamese people always have big celebrations ____________________ New Year.

16. Bye. Don’t forget our plans. Let’s see each other ___________________ the New Year.

17. _________________ Easter Sunday, young children receive some small chocolate eggs.

18. Easter egg hunts are popular _____________________ Easter.

19. Bob’s father is different ____________________ Jack’s in character and height.

20. They look much alike. We can’t distinguish one twin __________________ the other.

21. Rita was proud _________________ her success in her youth.

22. Here you are ________ last! I’ve been so worried! Thank goodness you’ve arrived safely. 23. Let me congratulate you _____________________ your excellent exam results.

24. Most girls are afraid ___________________ going out alone _______________ night.

25. We sometimes go to the theatre or the opera _________________ a friend ____________ Sunday nights.

26. It rained heavily _________________________ the night.

27. _______________________ the first night of my stay in Paris, I couldn’t get to sleep.

28. Were you satisfied ______________________ your last Christmas?

29. He was late _____________________ the show due _________________ the traffic jam. 30. This generous present was given _________________ me ________________ my parents ____________________ my 18th birthday.

31. The Youth Cultural House _____________________ Pham Ngoc Thach Street is open ___________________ public holidays.

32. What lessons can you draw _____________________ that serious mistake?

33. I am permitted to stay up late ___________________ late-night horror movies.

34. Do you often fly to Asian countries _____________ business or ____________ pleasure? 35. I have to help mum _____________ her household chores while she is __________ work. 36. Sorry, I have no time to talk to you ____________ the moment – I’m __________a hurry. 37. Thanks ____________ the present! I have always dreamt _____________ a pet goldfish!

38. We will go ________________ a trip ___________________ the museum next week.

39. I wish I could afford to go ______________ a tour ________________ Southern Vietnam.

40. Volunteers are ready to help people ______________ need _______________ being paid.

MN GIÚP TỚ VỚI Ạ

Choose the best answer.

I think you should buy _____  pack of mineral water instead. And you can also buy _____  snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______  cookies and soft candies.

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.