The most useful learning in the world is that ___ teaches us how to die well.
—Waiter!— —I can’t eat this. It’s too salty.
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
______ I had done it I knew I had made a mistake.
Elbert Einstein, for ______ life had once been very hard, was successful later in science .
You are really very kind. I’ll never forget the you have done to me.