An old man lived alone in his old house. He hardly ever went out．He wouldn't ____with others．One day， a little boy setting____knocked (敲)at the old man's door .The door slowly opened. “Uh，sir， would you like to buy a magazine?”The old man didn't say anything．He____stared(注视)at the boy．The boy looked inside and saw lots of dog sculpture(雕塑品)on the table．“Do you collect dogs?" the boy asked．“Yes，they are all my family．”Hearing this，the boy ____. and felt sorry for him．“I have a magazine here about dogs．It's perfect for you．”The old man was ready to close(关) the door and said，“No，I don't____any magazines．”

The boy suddenly had an idea．He had a dog sculpture， which did not mean much to____．After a while，the boy returned____a box．The old man shouted this time．“I told you no magazines!”“I bring you a girl．”The boy ____the box and handed him the sculpture．The old man got____because no one had given him a gift before．From that day on，the old man started going out of his house often．He and the boy because good____．The boy even brought his pet dog to visit me old man every week．

世界上最大的国际组织是联合国，其总部设在    （    ）

     What is color? Why do some of the things around us look red, some green, others blue?
    Colors are really made by deflected (反射) light. We see color because most of the things reflect light. In the same way, if something is green, it reflects most of the green light. If something reflects all light, it is white. If it doesn't reflect any light, it is black.
Some of the light is reflected and some is taken in (吸引) and turned into (变成) heat (热能).The darker the color is, the less light is reflected, the more light is taken in. So dark-colored clothes are warmer in the sun than light-colored clothes.