Viết lại các câu sau đây sao cho nghĩa không đổi

1.We have to follow more thanh ten stages. We can make a simple conical hat. ( order )
We have to .......................................................................................................................
2.We don't know where we should put the sofa. ( Question words + to-infinitive )
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3.We must find out what are we to do next. ( Question words + to-infinitive )
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