Scientists say it may be five or six years （ ） this medicine is tested on human beings.

Air pollution is obviously one of the major _____ of city life.

Patients’bills of rights require that they （ ） informed about their condition and about alternatives for treatment.

Mr. Jones, _____ life was once very hard, is now very successful in his business.

The color of the skirt does not （ ） that of the coat.

（ ） we have all the materials ready, we should begin the new task at once.

The girls （ ） a pizza and two drinks and took them to a dining table.

Space vehicles were launched into outer space_____search of another living planet.

Our company’s service is （ ） in nearly 80 countries around the world.

You （ ） read the article if you don’t want to.

The twin sisters look so much alike that I could never tell _____.

She insisted that the seats in the theater （ ） in advance to insure a better view．