Find, underline and correct one mistake in each sentence

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b. Find, underline and correct one mistake in each sentence.
1. "How we ought to deal with this difficult problem?"
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2. Tom was late for the interview; he should have got up later.
3. On an account should the children go on their own.
4. If you didn't left the door open 2 hours ago, the room would not be full of flies now.
5. This button must not been touched while the experiment is in progress.