按要求改句子。（1—4的划线部分提问）
1. Mum is looking for the key to the room.
___________________________________________?
2. Jack is late for school.
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3. The building is thirty years old.
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4. The girls are dancing in the playground.
__________________________________________?
5. There is something wrong with my bike.（改为否定句）
_______________________________________________.
6. is/is/Mary/she/sitting/no/not（连成问答句）
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7. We are having an English class.（改成一般问句）
_________________________________________________?
8. It's time for bed.（不改变句意，改写句子）
_______________________________________________.
9. Stand in the sun.（改为否定句）
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