Exercise 1: Kết hợp câu dùng câu điều kiện 1. He can't go out because he has to study for hisexam.  If ................................................................................................................................................................ 2. She is lazy so she can't pass theexam.  If ................................................................................................................................................................. 3. He smokes too much; that's why he can't get rid of hiscough.  If ................................................................................................................................................................ 4. I can't play football this afternoon because I felttired.  If ................................................................................................................................................................. 5. Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from thehighway.  If ................................................................................................................................................................. 6. She can't be employed because she doesn't have a collegedegree.  If ................................................................................................................................................................. 7. She walked to the meeting. She waslate.  If ................................................................................................................................................................ 8. Unless you promise to return back, I won't lendyou.  If ................................................................................................................................................................ 9. We put off our trip because the weather wasterrible.  If ................................................................................................................................................................ 10. Sally doesn't know what she has to do for homework because she was absent from school onFriday.  If ................................................................................................................................................................. 11. If you do not like this one, I'll bring youanother.  Unless ......................................................................................................................................................... 12. Martin failed his driving test last week because he was verynervous.  But for......................................................................................................................................................... 13. He will pay me tonight; I will have enough money to buy acar.  If ................................................................................................................................................................ 14. Leave me alone or I'll call thepolice.  If ................................................................................................................................................................ 15. If you arrive at the office earlier than I do, please turn on theair-conditioner.  Should......................................................................................................................................................... 16. He died so young; otherwise, he would be a famous musician bynow.  Had it .......................................................................................................................................................... 17. The car breaks down so often because you don't take good care ofit.  Were you ................................................................................................................................................... 18. Don’t tell lies to your boss or you'll be fired atonce.  If ................................................................................................................................................................. 19. He didn't revise all his lessons, so he failed theexam.  Had ........................................................................................................................................................... 20. Rita is exhausted today because she didn't get any sleep lastnight.  If .................................................................................................................................................................