I saw a woman running toward me in the dark.Before I could recognize who she was,she had run back in the direction____she had come.
We couldn’t understand: what could ______ his sudden change of mind?
I didn’t mean to break your vase—it was just ______.
He was breathing ______ after the relay race.
People are concerned about the quality of the air they ______.
She walked home by herself, ______ she knew that it was dangerous.