(I) Before the exam she felt surely of excelling, but when the exam started, she realized that it is not going to be so easy. (II) I know that eventually he will succumb to me and confess that he has committed a crime (III) In his valedictory speech he said nothing worth listening to.

Explanation

The correct sentence in this is sentence (II) In sentence (I), “surely” should be replaced with “sure”, because “felt” is the past form of “feel” and “feel” is a copular verb (It is a special kind of verb used to join an adjective or noun complement to a subject. Common examples are: be (is, am, are, was, were), appear, seem, look, sound, smell, taste, feel, become and get.) and after it adjective is used not adverb. In sentence (III), “listening to” should be replace with only “listening”. The correct form of “listen to” is “listen + to + object”