Read the following text and fill in the blanks with suitable words 0-5×10 from the box. There are more words than needed. Make any =5 grammatical change if necessary.

device	trained	abour	perform	essential	great
abacus	large	special	recent	refer	call

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.