Đặt câu hỏi cho phần gạch chân trong mỗi câu sau

III-Đặt câu hỏi cho phần gạch chân trong mỗi câu sau:

1. Our school year starts on September 5th.

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2. Summer vacation lasts for three months.

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3. The longest vacation is summer vacation.

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4. I usually visit my granparents during my vacation.

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5. My mother works eight hours a day.

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6. Mr. Robinson is an English teacher.