Directions (Qs. 28 to 47): Look at the underlined part of each sentence. Below each sentence, three possible substitutions for the underlined part are given. If one of them (A, B or C) is better than the underlined part, indicate your response on the Answer-sheet against the corresponding letter A, B or C. If none of these substitutions improves the sentence, indicate D as your response on the Answer-sheet. Thus a "No Improvement" response will be signified by the letter D.

30. He succeeded by dint of hard work.