Our teachers often encourage us that everyminute we spend on studying will finallyin thenear future．

It is required that passengers remain ________ when the plane is taking off or landing.

Living in the central Australia desert has its problem, _____ obtaining fresh water isn’t the least

Owing to her balanced diet and regular exercise, she is very slim and athletic _____

They were thirsty, so they went ______ something to drink. [ ]