30.Nothing is wrong with the radio___________?

31.

In which part of the play is it　　　　Lily will play a role?

  A. where                          B. which               C. that                          D. who

______that silver is not widely used as a conductor(导体)?

A. Why is 　　 B. Is it why   　　C. Why is it 　　   D.  Why it is

—I’m awfully sorry I can’t go with you.?

—__________?Haven’t you agreed??

A.How is it                   B.What is it　

C.Why don’t you　              D.What do you think?

Nothing is wrong with the radio 　　　　　　?