Fill in the blank with a suitable option. You _________ do your homework. If you don’t, you’ll fail the examination.

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Must

Had to

May

Might

answer is A.

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Detailed Solution

Concept- Modal verbs are those verbs which are used to indicate capacity, probability or requirement. For example- Can, could, should, may, might, will, etc.
The usage of different modal verbs:
1) Must- It is used to indicate commitment or duty to do something. For example- You must fill in the required details.
2) Had to- It is the past tense form of ‘must’. It is used to indicate obligation or commitment in the past. For example- I had to visit the shopping mall last night.
3) May: It is used to indicate probability or permission. eg: You may enter the classroom.
4) Might- It is used to indicate possibility or probability. For example- I might be late to service.
In the context of the given question, we know that if ‘A’ doesn’t complete his homework, he will fail the examination.
Hence, the correct answer is, (1) Must.

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