The school rule states that no child shall be，unless________by an adult，allowed out of the school during the day.

The bridge _________2,000 meters long was designed by Frank.

____ with a difficult situation, Mr Smith made up his mind ____ his boss for advice.

Hearing his words，I couldn’t decide ______or remain.

________from space, the earth, with water_____seventy percent of its percentage, looks like a “blue ball.”