شرکت در آزمون آنلاین زبان انگلیسی 1 - درس 4 | آزمون شماره 203

1-

His recent ............................. is because of his advancing age and that's normal, isn't it?

2-

.......................... is the mother of invention. It means that we invent things when we are in need of them.

3-

Even on holidays , she is ............................ the Internet for more information about her business .

4- Iranian people believed that it was their ......... to help those who had lost their homes in the earthquake.

5-

Another interesting source of energy is the heat that ............................ be recovered from radioactive waste material.