Fill in the blank with the most appropriate modal denoting duty.
We _______ to honour our parents.
A
Ought
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B
Should
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C
May
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D
Can
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Solution
The correct option is B Ought 'Ought' is different from other auxiliary verbs, it is followed by a to-infinitive. Ought expresses idea such as duty, necessity, moral obligation. It is not forceful as must but is stronger than should.
The sentence expresses a moral obligation, therefore 'ought' is the apt choice.
Whereas 'should' shows a weaker degree of necessity, 'may' refers to a probability, and 'can' shows the ability. Therefore options B, C, D are incorrect.