discover,find,find out,invent辨析

discover:“发现”,发现那些存在,只是未被发现的东西
find:“找到、发现”,指寻找到所需的东西,强调结果
find out:“查明、找出”,经过观察、调查、研究而查出事情的情况
invent:“发明”,指经过研究、设计而创造出前所未有的东西
*1.
-Do you know something about Thomas Edison?
-Well,he ____ the electric lamp(电灯).
*2.
According to an ancient Chinese legend,the emperor Shen Nong ___ tea more than three thousand years ago.
*3.
-Could you please help me ____ the next flight to Beijing.
-Sure. Just wait for a moment.
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