Directions: Fill in the blanks with the appropriate pair of words to make the sentence a meaningful one. Each sentence is followed by five pairs of words. Choose the correct pair.

The continued __________ dumping of effluents has intensified concerns regarding the _______ effects on our ecosystem

The key word is ‘concerns’. ‘Restrained dumping’ would not lead to intensification of concerns. With informal we have ‘beneficial’ for second blank. 'Beneficial' is ruled out as it would not raise concerns. ‘Antagonistic’ means unfriendly, which does not fit in with the context. ‘Aiding’ and ‘hazy’ are similarly ruled out. So, correct answer is option 5.