Q567
We must explore . . . . . . . . sources of energy as our supply of fossil fuel has been . . . . . . . .
A.
alternate , depleted
B.
guaranteed , over
C.
natural , exhausted
AnswerD.
sufficient , increased
E.
innovative , augmented
Answer: Option C
Solution
Answer: Option C
Solution:
We must explore natural sources of energy as our supply of fossil fuel has been exhausted.