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Rewrite the sentences using the words given.
1. It wasn't a good idea to leave your rubbish on the beach. (shouldn't )
You_____________________________
2. The most logical explanation is that someone stole the paintings form the art gallery. (must)
Someone________________________
3. It wasn't necessary to ask Paul to come and help us. (need)
You____________________________
4. I think Louise drew the dragon on the wall. (may)
Louise___________________________​