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with “adept” we use ‘at’
attract customers the stores run multiple benefits (offers)
several is plural…… And several more which make it difficult for local businesses to compete with.
Even though supermarkets provide
in the conclusion paragraph you need to give a clear indication that you’re ending your essay by including words like “in conclusion, to incapsulate, to sum it up, etc..”
There is a coherence issue in the introduction and conclusion paragraph. They are contradicting each other.