Complete the following text with suitable verbs in the box with their right forms. $\begin{array}{|l|l|l|l|l|} \hline \textbf{invent} & \textbf{add} & \textbf{prosper} & \textbf{depend} & \textbf{be} \\ \hline \end{array}$ Man (a) — the maker of his own fortune. If we are afraid of work, we cannot (b) — in life. Some people think that success in life (c) — on luck. Scientists have toiled day and night in their laboratories with a view to (d) — radio, television and computer. These instruments (e) — to the joy of our life.