Fresh air, enough exercise and nutritious food （ ） to good health.

The meeting is to begin at 4:00 p.m., but as assistants, we’re （ ） to be there a bit earlier.

Solar energy is a new kind of energy _____ that we can use to replace the traditional energy.

Mr. Phillips caught up with the boy in the corridor and （ ） his hand on his shoulder.

Take your time and think the matter over before you _____ a conclusion.

The local government is trying all out to find out who is （ ） the forest fire.

The tribe had been living in that part of the area for generations until the civil war ______.

There is a warning at the bottom of the form that applicants are requested to hand in their forms _____ person.

He apologized _____ having to leave so early.

Without the sun’s light （ ） the earth’s surface, no life could exist on the earth.

Scientists now have some surprising answers about whether brain power（ ）as we get older.

Only when （ ） in the afternoon （ ） able to leave.