The computer is a fairly (a)------ invention. It has now become an (b) ---- part of modern life. It has greatly benefited us and brought (c)----- revolutionary changes in our life. Any (d)---- that helps people perform mathematical calculation may be (e)----- a computer. In this sense the (f)----- is a simple computer. Today, however, the term, computer (g)----- to a special kind of electronic machine that can perform mathematical calculations and process (h)----- masses of information at a (i)-----speed. In a few minutes a computer can perform calculation that (j)------. mathematicians would need years to complete.

Ans: 

(a) recent;  (b) essential; (c) about; (d) device;  (e) called; (f) abacus; (g) refers; (h) large;  (i) great;  (j) trained

The computer is a fairly (a) recent invention. It has now become an (b) essential part of modern life. It has greatly benefited us and brought (c) about revolutionary changes in our life. Any (d)device that helps people perform mathematical calculation may be (e) called a computer. In this sense the (f) abacus is a simple computer. Today, however, the term, computer (g) refers to a special kind of electronic machine that can perform mathematical calculations and process (h) large masses of information at a (i) great speed. In a few minutes a computer can perform calculation that (j) trained. mathematicians would need years to complete.