Question
 It has been known for years that ______ of natural
gases can be _________ for health. Fill in the blanks with the words that best fit the meaning of the sentence as a whole.ÂSolution
with injurious, we use TO, hence option 1 is incorrect. with WORSE we use comparison, hence THAN should be used. CONTAGIOUS means which can spread, it is not fitting the context. Natural gases are not consumed, so 4th option is incorrect as per context. Also, the form of this word is wrong. we don't say consuming OF something, instead CONSUMPTION of something. With CONSUMING we dont use OF It has been known for years that burning of natural gases can be harmful for health. Â
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