—Did you tell your headmaster that the teachers and students had a number of ________ their lunch?

—Yes. He said he must solve this problem.

A. complains about   

B. complaints of   

C. complaints about

D complaints of 

（）是合同或者合同的组成部分。

A、旅客车票

B、行李票

C、包裹票

D、货物运单