We can develop alternative sources of energy, and unless we try, we’ll never succeed. Instead of burning fossil fuels, we should be concentrating on more economic uses of electricity, because electricity can be produced from any source of energy.

If we didn’t waste so much energy, our resources would last longer. We can save more energy by conservation than we can produce for the same money. Unless we do research on solar energy, wind power, tidal power, hydroelectric plants... our fossil fuels will run out and we’ll all freeze or starve to death.

Many countries are spending much more time and money on research because the energy from the sun, the waves and the winds last forever. We really won’t survive unless we start working on cleaner and safer sources of energy.

31. Alternative sources of energy can be developed ____________.

A. if we don’t try                                B. unless we don’t try

C. if we try                                        D. no matter how hard we try

32. Electricity can be generated from ____________.

A. wind power                B. solar power                C. water power        D. all are correct

33. One way to prevent fossil fuels from running out is ____________.

A. keeping the environment clean                B. building reserves

C. doing research on sources of energy        D. planting more trees

34. The energy from the Sun, the waves and the winds is ____________.

A. abundant                B. limited                C. polluted                D. non-rewable

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