(2014·河南豫北三校联考)________is well known to everyone，I should say，is that a man becomes learned by asking questions

y directors ________, the boardmeeting had to be put off.

Though he was world famous, Einstein didn’t really his clothes.

Where did you get to know him— I think it was in the factory______ I worked ten years ago.

Mary decided not to work on the program at homebecause she didn’t want her parents to know what she __________.