1 Answers
(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 special kind of electronic (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.