The little girlwas unhappy_________her picture-book broken.

ctor must be _______ 24 hours a day, 7 days aweek in the boarding school.

I have a tight budget for the trip，so I’m not going to fly ________ the airlines lower ticket prices.(2012·上海，32)

Many people worry that air pollution mightchanges in the weather around the world.

The equipment for disabled people should be ______easy reach in public places.