WISH CLAUSES Mark the correct option A, B, C or D: 1. I don't understand this point of grammar. I wish I ______ it better. A. understood             B. would understand     C. had understood         D. understands 2. It never stops raining here. I wish it ______ raining. A. stopped                  B. would stop                 C. had stopped               D. will stop 3. I miss my friends. I wish my friends ______ here right now. A. were                       B. would be                    C. had been                    D. was 4. I should never have said that. I wish I ______ that. A. didn't say                B. wouldn't say              C. hadn't said                 D. says 5. I speak terrible English. I wish I ______ English well. A. spoke                      B. would speak              C. had spoken                D. speaks 6. I cannot sleep. The dog next door is making too much noise. I wish it ______ quiet. A kept                         B. would keep                C. had kept                     D. will keep 7. This train is very slow. The earlier train was much faster. I wish I ____ the earlier train. A. caught                    B. would catch               C. had caught                 D. catches 8. I didn't see the TV programme but everybody said it was excellent. I wish I ___ it. A. saw                         B. would see                  C. had seen                     D. seen 9. I went out in the rain and now I have a bad cold. I wish I ______ out. A. didn't go                 B. wouldn't go                C. hadn't gone                D. went 10. This movie is terrible. I wish we ______ to see another one. A. went                       B. would go                   C. had gone                    D. go 11. I hate living in England. It's cold and it's damp. I wish I ______ in Spain. A. lived                       B. would live                  C. had lived                    D. live 12.  I was only in Miami for a week. I wish I ______ more time there but I had to go on to New York. A. had                         B. would have                C. had had                      D. have 13. You drive too fast. I wish you__________   more slowly.       A. drive                       B. drove                         C. had driven                 D. would drive 14. He missed an exciting football match on TV last night. He wishes that he _______ it.            A. watched                 B. would watch              C. had watched              D. watches 15. My face is bright red. I wish I ______ in the sun so long yesterday A. didn't sit                 B. wouldn't sit                C. hadn't sat                   D. sat 16. It was supposed to be a secret. I wish you ______ him. A. didn't tell                B. wouldn't tell              C. hadn't told                 D. tell 17. They didn't offer me the job. I wish they ______ it to me. A. offered                   B. would offer               C. had offered                D. offer 18.  It’s a pity I didn’t take my doctor’s advice. -I wish you __________ the doctor's advice.       A. took                        B. would take                 C. had taken                   D. could take 19. I hate having red hair. I wish I ______ blonde hair. A. had                         B. would have                C. had had                      D. am having 20. This exercise is very boring. I wish the teacher ______ us some more interesting things to do. A. gave                        B. would give                 C. had given                   D. will give 21.  I wish I__________ a doctor in the future.       A. am                          B. were                           C. had been                    D. would be 22. I wish that some day I ___________ able to marry her.       A. will be                    B. am                              C. would be                    D. had been 23. I wished I_________ enough money to buy the house.       A. had                         B. have                           C. had had                      D. would have 24. John wishes he ________   a scientist when he grows up.               A. is                             B. was                            C. will be                       D. would be 25. You talk more than you work. The teacher wishes that __________.        A. you work more than you talk              B. you worked more than you talked       C. you worked more than you talk           D. you had worked more than you had talked 26. Susan regretted not buying that villa.           A. Susan wished she had bought that villa.           B. Susan wished she bought that villa.           C. Susan wished she could buy that villa.                    D. Susan wished she hadn’t bought that villa. 27. It’s a pity that you didn’t tell us about this.           A. I wish you told us about this.                        B. I wish you would tell us about this.           C. I wish you had told us about this.                 D. I wish you have told us about this. 28. I’m afraid he won’t get over his illness.           A. I wish he will get over his illness.                 B. I wish he would get over his illness.           C. I wish he got over his illness.                        D. I wish he had got over his illness. 29. Peter regretted buying the secondhand computer.           A. Peter didn’t want to buy the secondhand computer.           B. Peter wished he didn’t buy the secondhand computer.           C. Peter wished he hadn’t bought the secondhand computer.           D. Peter was glad to buy the secondhand computer. 30. I regret that you didn’t give me a chance to tell you the truth.           A. I wish you didn’t give me a chance to tell you the truth.           B. I wish you gave me a chance to tell you the truth.           C. I wish you had given me a chance to tell you the truth.           D. I wish you hadn’t given me a chance to tell you the truth.

Để giải các phương trình hóa học trong câu hỏi trên, ta cần làm các bước sau:

Bước 1: Viết công thức hóa học của các chất tham gia và sản phẩm.
Bước 2: Cân bằng số nguyên tử trên các hai bên của phương trình hóa học bằng cách thay đổi hệ số trước các chất.

Câu trả lời cho câu hỏi trên:
1. FeO + 2HCl => FeCl2 + H2O
2. CuO + H2SO4 => CuSO4 + H2O
3. 2Al + 3H2SO4(đ) => Al2(SO4)3 + 3SO2 + 3H2O
4. CaCO3 => CaO + CO2
5. CaCO3 + 2HCl => CaCl2 + CO2 + H2O
6. Mg + 2HNO3(1) => Mg(NO3)2 + 2NO + H2O
7. Na2CO3 + Ca(OH)2 => CaCO3 + 2NaOH
8. Fe2O3 + 3CO => 2Fe + 3CO2
9. Fe2O3 + 6HCl => 2FeCl3 + 3H2O
10. 3Fe3O4 + 8H2SO4 => 3FeSO4 + 2Fe2(SO4)3 + 8H2O

Đây là các phương trình đã được cân bằng đúng theo nguyên tắc bảo toàn số nguyên tử.