The bad weather （ ） the building program by several weeks．

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

We could see the stars （ ） well from the top of the mountain.

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

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

A new technique （ ）, the output as a whole increased by 20 percent.

_____the plan carefully, he rejected it.

（ ） is careless when disposing of his wastes.

Dentists suggest brushing teeth at least twice a day to _____ them from decaying.

The committee is _____ session; no one can enter the hall.

Humble （ ） it may be, there is no place like home.

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