4. Read the following text and fill in the blanks with suitable words from the box. There are more words than needed. Make any grammatical change if necessary. $\\$ $\begin{array}{|c|c|c|c|c|c|}\hline \text { device } & \text { trained } & \text { about } & \text { perform } & \text { essential } & \text { great } \\\hline \text { abacus } & \text { large } & \text { special } & \text { recent } & \text { refer } & \text { call } \\\hline\end{array}$ The computer is a fairly (a) - inventiion. 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.

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