1．What does the man speaker suggest the woman do?
A．Open the door carefully． B．Have John fix the lock． C．Fix the door in time．
2．What's the probable relationship between the speakers?
A．Boss and secretary． B．Teacher and student． C．Husband and wife．
3．What was the lecture about?
A．Effective ways to give up smoking．
B．The harmful effects of second-hand smoke．
C．Prof．Smith's new invention．
