When delivering a speech, you have to speak clearly and slowly to make yourself (understand) ______.

A．The woman doesn’t like smoking.
B．The place is air-conditioned.
C．This is a non-smoking area.
D．Nobody smokes here.

A．To tell her about his sister’s arrival.
B．To discuss some business affairs.
C．To invite her to a party.
D．To ask for a day’s leave.