Public service advertisements are often run _____ free, and are ______ to educate people about health, safety, or any other issue which affects public welfare.
She always finds _____ a waste of money and time ______a day dream in school. that; to dream B. this ; to dream C. its; dreaming D. it ; dreaming
________ will be in charge of the project______ been decided yet.
______worried the child most was _____ to visit his mother in the hospital.
We shouldn’t complain about________, because many families are much _____ in the mountainous area.
All the machines stopped _____ with the electricity _____ throughout the factory.