Please is fine. Also: Come on (less formal)
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hanuman_2000I don't think 'please' is suitable because of the comma before 'have'. Have you inserted a comma inadvertently?
1. I have brought some biscuits. __, have one.
I have to fill in the blank with a suitable word. I can only think about "please".
khoffPlease, have one" seems fine to meTo me, "Please, have one" is not correct. "Have one, please" is fine.
I searched under Please, (with comma) have one, but found the following instead:
by Leo Tolstoy, Louise Maude, Louise Shanks Maude, Ay