Select the most appropriate option to fill in the blank.

We ______ learn to meet adversity gracefully.

must

The most appropriate option to fill in the blank is: must

The sentence suggests a necessity or obligation to learn to meet adversity gracefully. "Must" expresses this sense of necessity or obligation effectively in the sentence. Therefore, "must" is the most suitable word in this context.

• Have suggests it's a possibility or something that has already happened, which might not be the case.
• Ought implies a moral obligation, but "must" conveys a stronger sense of necessity.
• Had refers to the past, and the sentence talks about a general ability to face challenges.
• Must emphasizes the importance of learning to face adversity with composure. It's a skill we need to develop.