6.  A. It could be Tony’s.      B. Yes, it does.              C. Never mind.

7.  A. You must study hard.    

B. You must obey the traffic rulers. 

    C. You must look after your child.

8.  A. I think so.             B. It doesn’t matter.          C. You’re welcome.

9.  A. Yes, she does.          B. Wow, People sure change.   C. I’m afraid not.

10.  A. It’s too hard to understand. B. What about you?     C. By teaching yourself.