8. Nobody knows ___ he mentioned that at the meeting.

　　A. that B. why

　　C. what D. where

　　9. There is no doubt ____ my friend was not important to them all.

　　A. that B. whether

　　C. if D. why

　　10. I have no idea ____ they will visit our school; we have got everything ready.

　　A. how B. when

　　C. that D. why

　　Key 1-5 DDABD

　　6-10 ABBAB