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You are emailing your terrifyingly strict literature professor to clarify the homework assignment before the weekend. You want to make sure your grammar is absolutely flawless.
Select ALL the grammatically correct ways to ask about the reading assignment.
The correct answers are Which specific chapters should we focus on? and On which specific chapters should we focus?
The verb "focus" pairs with the preposition "on". In a question, you can place the preposition at the end of the clause ("Which... on?") or, in more formal writing, immediately before the question word ("On which..."). Both are perfectly correct!
The option without "on" is incorrect because "focus" requires the preposition to connect to its object. The final option is incorrect because questions require auxiliary verb inversion ("should we", not "we should").