Here are the answers with the appropriate modals filled in: We must obey our teachers. She ought to tát pass this time. He need not buy a xế hộp. He must fail. Do you have to tát cook your own meal? The villagers had to tát use kerosene lamps a few years ago. The old lady ought to tát take a bath every day before taking meals. She has to tát finish this work before I go. Ramesh said that they had to tát report for duty on Monday.

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