Fill blank (i).

Directions: Read the following passage having some numbered blanks.

The Internet was started as a/an (i) ______ to test networks to try and develop a network that could survive a nuclear attack. While the net has never (ii) ______ to survive a nuclear blast its design has proven again and again how robust it is. It has withstood (iii) ______ an attack from construction, people digging up cables, to lightning blowing up a router. The network has always recovered (iv) ______ bypassed the problem. The Internet (v) ______ as the Advanced Research Projects Agency Network (ARPANET) during the cold war in 1969. It was (vi) ______ by the US Department of Defense's (DOD) research people in (vii) ______ with a number of military contractors and universities to explore the possibility of a communication network (viii) ______ could survive a nuclear attack. It continued simply because the DOD, DOD's contractors, and the universities found that it provided a very (ix) ______ way to communicate. (x) ______ originally designed to allow scientists to share data and access remote computers, e-mail quickly became its most popular application.