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；
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1.
-Do you know something about Thomas Edison?
-Well,he ____ the electric lamp（电灯）.
found
found out
invented
discovered
*
2.
According to an ancient Chinese legend,the emperor Shen Nong ___ tea more than three thousand years ago.
found
found out
invented
discovered
*
3.
-Could you please help me ____ the next flight to Beijing.
-Sure. Just wait for a moment.
find
find out
invent
discover
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