Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: ঘ ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2013
Topic: Sentence (বাক্য), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The sentence "I finally killed the fly ... a rolled up newspaper" requires a preposition that indicates the means or instrument used to achieve the action of killing the fly. In this context, "with" is the appropriate choice because it emphasizes the tool employed in the action.

When we say "killed the fly with a rolled up newspaper," we convey that the newspaper served as the implement used to accomplish the task. This implies a direct relationship between the action (killing) and the tool (newspaper).

On the other hand, option A, "by," typically refers to the method or agent behind an action but is less direct in indicating the means. "Through" (option C) suggests an intermediary process rather than a tool, and "from" (option D) generally communicates a source or origin, neither of which accurately represents the intended meaning in this context.

Thus, "with" is the most precise choice as it clearly connects the action of killing to the instrument used, making it the correct answer.