Fill in the blank with the appropriate Preposition. Our sir teaches Mathematics ...... English.

means from one side to the other. It does not fit the context of teaching two subjects. 2. Option B: besides Besides means in addition to. This is the correct option because it indicates that English is another subject taught in addition to Mathematics. 3. Option C: beside Beside means next to or by the side of. It does not fit the context of teaching subjects. 4. Option D: both Both is a pronoun indicating two things. However, it requires a conjunction like and to make the sentence grammatically correct (e.g., "Our sir teaches both Mathematics and English"). Since the question is looking for a preposition, this option is incorrect. Therefore, the best option is B: besides, as it accurately conveys that the teacher teaches English in addition to Mathematics.