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Some mistakes hang over in these paragraphs.

I have hung up visiting job sites as I now don't need to search for a job at all.

My brother is telling something and my sister is telling something about the incident but overall their both stories do not hang together.

Please do not hang on these books as for the exam questions maybe asked from some other books.

If we five hang together, we can complete that project within a month.

Please correct my sentences.
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Some mistakes hang over in these paragraphs. Doesn't make sense - possibly 'are hanging on' but it still doesn't sound 100% natural.

I have hung up visiting job sites as I now don't need to search for a job at all. No, you can't use 'hung up' to mean stopped.

My brother is telling something and my sister is telling something about the incident but overall their both stories do not hang together. OK.

Please do not hang on these books as for the exam questions maybe asked from some other books. Doesn't make sense to me.

If we five hang together, we can complete that project within a month. OK, almost, but 'hang together' is very slangy so doesn't fit in a business situation, and really only means people socialising together anyway. Very 'teenagey' sounding.
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Thank you

Please do not hang on these books because questions maybe asked from some other books

Now is this sentence correct?

I applied the following meaning of the dictionary :

hang on/upon sth (DEPEND ON) phrasal verb
to depend on something:
The safety of air travel hangs partly on the thoroughness of baggage checking.