— These boxes are too heavy for me to move.— Here, I’ll give you a hand ____ them.
Jordan kept his illness from his opponents before the final game ________ they might know about it.
The order of DNA chemicals ________ whether a child has her mother’s eyes or her father’s smile.
The lively boy suddenly appeared to be ________ quiet, so his mother knew something unusual must have happened.
________ Mayan(玛雅)Calendar marks the end of the earth around December 22, 2012, which has caused ________ great panic among people.
— Shall we go out for a walk? — Oh, ________.