15．How cold it is! I wonder how grass survive under such heavy snow．–Don’t worry．There is a lot of air in loose snow which _______．

__________ yogurt do we need—Two cups.

What’s wrong with him—–The picture he came across ________his memory ofa sad story in his childhood.

下列各句中．没有语病的一句是 ( )

He jumped at the opportunity when he saw the advertisement in a newspaper, because barely _____ make ends meet.