14. We attend the seminar because it is important

=> If

15. "Have you finised your homework?", Dick said to Jane

=> Dick

16. I regret speaking to him so severely

=> I wish

17. The coffee was so strong that he couldn't drink it

=> bThe coffee was too....../ It was such

18. Jane speaks English better than we

=> We

19. Lan said to Nam "Don't make noise now or the teacher will punish you"

=> Lan

20. No one belives his story

=> His

21. Peter makes some progress in learning English because he attends class regularly

=> If

22. "How many students are there in your class, Lan?", said the teacher

=> The teacher

23. What a pity Jane doesn't leave early now

=> Jane wishes

24. They have to chage the date of the meeting again

=> The date

25. The film was so boring that we left before the and

=> It was

26. Tim runs faster than

=> I

27. Fred lives in that house. You saw it on the corner

=>