听下面一段较长对话，回答以下小题。
【小题1】What has Martin been busy doing?

A．Writing his paper.

B．Visiting his friends.

C．Preparing for his exam.

【小题2】Why is the woman worried?

A．Greg can't spare the time.

B．Greg can't hand in the paper on time.

C．Greg will be punished by the professor.

【小题3】What will the woman probably do?

A．Talk with her professor.

B．Ask someone else for help.

C．Switch shifts with the man.