Mary’s mother got sick, so she called ______

He failed in his business a third time andonly then ______ the difficult situation he was in.

Is air the lightest thing in the world?– Not .Scientists from Zhejiang University have just developed the world’s lightestmaterial.

Some research workers completely all those facts as though they never existed

Why didn’t you tell him about the meeting—He rushed out of the room ___________ I could say a word.