Disadvantages of Burning Fossil Fuels

Q.

Renewable sources of energy are _________, __________ and ________

Q.

What are harmful effects of fossil fuels?

Q. Out of the given alternatives, choose the one which can best replace the italicised word in the sentence without changing the meaning of the sentence.
The art movie I watched this evening has put me in a pensive mood.

1. reflective
2. cheerful
3. confused
4. depressed