We can develop alternative sources of energy, and (1)______we try, we'll never succeed. Instead (2)_____burning fossil fuels, we should be concentrating on more economical uses of electricity because electricity can be (3)____from any sources of energy

----- Nội dung dịch tự động từ ảnh -----
We can develop alternative sources of energy, and (1)
burning fossil fuels, we should be concentrating on more economical uses of electricity because electricity can be (3)
we try, we'll never succeed. Instead (2)
from any sources of energy. If we didn't waste so much energy, our resources would (4)
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 will run out and we'll all freeze or starve to death.
1. A. if
C. when
C. of
C. to produce
C. waste
B. unless
D. as
В. at
B. producing
В. run
2. A. on
D. for
3. A. produce
4. A. last
D. produced
D. recover