3. Do you know they are Englishmen or Germen?　　　　　　　　　　　 　　　　 　　　　　　　

2. I have a lot of works to do.　　　　　　　　　　　　　　　　　　　 　　　　　　

1. What do you plan to do after you have finished your homeworks?　　　 　　　　　　　

20. He'll accept the job unless the salary isn't too low.　　　　　　　　 　　　　　　　　 　　　　　　

　Keys:　1. but they→they　 2. and→or　3. if→whether　 4. As→Though　5. Both... and→Neither…nor 6. Hardly→Hardly had　7. took→didn't take 8. you do what→what you do　9. Since you know→You know 10. that→which　or so I needn' t→I needn't　11. what→that 12. will→won't　13. neither speaks→speaks neither　 14. In spite of→Though　15. and→or 16. so that→that17. If→Whether 18. not only difficult→difficult not onl19. like→as 　　20. unless→if

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19. The pen he is using now is the same like the one I lost.　　　　　　 　　　　　　　　 　　　　　　

18. English is not only difficult to write, but also to speak.　　　　　　 　　　　　　　

17. If you will come to see us is not unknown.　　　　　　　　　　　 　　　　　　　　　　　　 　　　　

16. He is so tired so that he cannot go.　　　　　　　　　　　　　　 　　　　　　

15. He did not write clearly and quickly.　　　　　　　　　　　　　 　　　　　　

14. In spite of he failed in the exam, he was not discouraged.