Answers

2016-02-17T07:38:02+05:30
1.First 3 letters indicate the biggest thing in world: SEA
2.Letters 2, 3, 4 indicate a part of human body: EAR
3.Letters 3, 4, 5 indicate part of circle: ARC
4.The whole word is the key of internet now SEARCH

Amswer: Search

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