___ of her two brothers has gone to college.

To save class time, our teacher has ________ students do half of the exercise in class and complete the other half for homework.

We don’t know the reason _____ he didn’t accept the job. 

I hate _____ when people talk with their mouths full.

The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.