Fill in the blank with suitable models.

We _________ help the poor and the needy.

ought to

The correct answer is Option (3) - ought to

"Ought to" expresses moral responsibility or correctness, making it the best fit. "We ought to help the poor and the needy."

Why not the other options?

• Will shows future certainty, not a moral duty.
• Shall is used for formal or legal obligations, but ought to is better for moral responsibility.
• Had to refers to a past obligation, but the sentence is general.