30. I found _______ to hear what he said .

　　　 A. that difficult　 B. it difficulty　 C. that difficult　 D. it difficult

29. Jack is ill. Have you heard about _______ ?

　　　 A. him　 B. it　 C. this　 D. that

28. ---Do you have my pen , Mary ? ---Yes ,I have ______ right here .

　　　 A. one　 B. it　　 C. this　 D. that

27. Does _____ matter if he can`t finish the job on time ?

　　　 A. this　 B. that　 C. he　 D it

26. ① It was on October 1, 1949that New China was founded.

② It was October 1, 1949 when New China was founded.

25. ① It might be tomorrow that we should arrive .

② It must have been in the street that you met him .

24. ① It is he that is to blame .

② It is I who am to blame .

23.　①　陈述句：It was you that came yesterday.

一般疑问句：Was it you that came yesterday ?

特殊疑问句：Who was it that came yesterday ?

②陈述句：It was last night that they had a get-together with the workers.

一般疑问句：Was it last night that they had a get-together with the workers ?

特殊疑问句：When was it that they had a get-together with the workers?

22. ① It was with great difficulty that the boy gathered the strength to speak , but he spoke with a frightful emphasis .

② It was the first time that I longed for a new day to come .

③ It was in the library that I left my book.

21. ① It took me more than two hours to finish the work .

② I consider it my duty to help him .

③ I don`t like it when you shout at me .

④ I think it no use arguing with him.