51. May I see your tickets, please?

A. 　Do you have a reservation?

B. 　Have you paid beforehand?

C. 　Have you made an order?

D. 　Do you have an appointment?

A. 　a porter

B. 　is a porter

C. 　as a porter

D. 　that of a porter

A. 　What a pleasure

B. 　Pleased to meet you

C. 　I don’t know

D. 　Thanks a lot.

A. 　nor

B. 　or

C. 　but

D. 　And

A. 　kind

B. 　type

C. 　sort

D. 　category

A. 　there

B. 　which

C. 　one

D. 　that