Read the following. text and fill in the blanks with suitable words from the box. There are more words than necessary. Make any grammatical change if necessary:

device	trained	about	perform	essential	great	abacus
fairly	large	special	recent	sense	refers	called

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 special kind of electronic (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.