Question

As soon as the sun rose over the hills the fog disappeared.
Begin with: No sooner...

Answer 1

No sooner did the sun rise over the hills than the fog disappeared.
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Answer 2

No sooner did the sun rose over the hill than the fog disappeared.

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Other sentence, No sooner did the sun rise over the hills than the fog disappeared.

This is also a right answer so that you will have a best answer for managing with right answer.