举例说明方位名词有哪些小类，其语法特征是什么？

A. She is a travel agent.
B. She is a(real) estate agent.
C. She sells cars.
D. She sells hotels.

At all the entrances.
B. At some entrances.
C. At all the exists.
D. At some exists.

A. The computer class will be held tomorrow morning.
B. She will give the man the class schedule in the afternoon.
C. She can't give the man the information he wants today.
D. She doesn't know how to get the class schedule.

A. On the walls of caves.
B. On a heavy clay tablet.
C. On woods.
D. On cloth.