Refer to explanation

Correct Option: C

The sentence deals with resolving a dispute by talks and negotiations but attempt to forge agreement/ at reaching a solution given in choice A and C respectively makes sense. The attempt proved abortive (useless) completes the sentence. Reject the agreement /acquire dark shades are negative. So, they can not go with the given part. Choice D is rhetoric sentence. Choice C is correct

Refer to explanation

Correct Option: B

Action is defined positively, so it saves man from some negative effect/condition. So, the choice should have negative words. "Use of faculties, prerequisites" in choice A and D are positive. The sorrow of fellow beings does not put a man in danger. Hence choice C is irrelevant. Activity keeps a man happy and agile

Refer to Explanation

Correct Option: D

In order to generate income at high rate, initial investment requirements such as network facilities should be substantial. This is given in choice D, which is apt."Slow and steady progress" given in choice A and "willingness to do" given in choice B do not lead to profitable conditions

All other options have the modifier 'only' in the wrong place.

Correct Option: C

All other options have the modifier 'only' in the wrong place.

From option (b), it appears cancer can be used in a day

Correct Option: A

From option (b), it appears cancer can be used in a day