6. The reason______ being late for the meeting was______ his little son fell ill this morning.  

A. for, that              B. why, that        C. for, because               D. why, because

7.I didn’t see her in the meeting room this morning. She ___ at the meeting.

A. mustn’t have spoken                  B. shouldn’t have spoken 

C. needn’t have spoken                  D. couldn’t have spoken

8.The number 9.11 is a special number, ___, I think, that will be remembered by the Americans forever.

A. what                 B. it                C. which                      D. one