Write questions for the underlined parts

Exercise 6: Write questions for the underlined parts.
1.Hoa received her aunt’s letter five days ago.
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2.There are twelve students in Lien’s class.
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3. She stayed at home because she was sick.
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4. They walked to the park yesterday
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5. I bought 12 eggs last week.
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6. He learns English twice a week.
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