13. You'll get pneumonia if you (not change) _______________ your wet clothes. 14. If I had known that you couldn't eat octopus, I (not buy) _______________ it. 15. If they (hang) _______________ that picture lower, people would be able to see it. 16. She (be) _________________able to walk faster if she didn’t have such high-heel shoes. 17. I (bring) _______________ you some beer if I had known that you were thirsty. 18. If you had touched that electric cable, you (be) _______________ electrocuted 19. If the story hadn't been true, the newspaper (not print) _______________ it. 20. I (not buy) _______________ things on the installment system if I were you. 21. Dan (arrive) _______________ safe if he drove slowly. Bài 2: Chọn đáp án đúng để điền vào chỗ trống 1. __________then what I know yesterday, I would have saved myself a lot of time and trouble over the years. A. had I known B. did I know C. If I know D. If I would know 2. Do you think there would be less conflict in the world if all people __________the same language? A. spoke B. speak C. had spoken D. will speak 3. If you can give me one good reason for your acting like this, __________this incident again. A. I will never mention B. I never mention C. will I never mention D. I don’t mention 4. If I had known you were asleep, I __________so much noise when I came in. A. didn’t make B. wouldn’t have made C. won’t make D. don’t make 5. Unless you __________all of my questions, I can’t do anything to help you. A. answered B. answer C. would answer D. are answering