听一段材料，回答下面几个小题。
Why is the speaker leaving for London?
A.To visit some museums.
B.To attend a conference.
C.To go on business.
What will the speaker do in London?
A.Meet his old teacher.
B.Study English literature.
C.See the dentist.
Who does the speaker want John to telephone?
A.Peter.    B.The teacher.    C.The dentist.