The sentences that include errors in the use of possessives or contractions that should be corrected are:
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"Don't forget to pack your coat and hat, because its going to be snowing in Minnesota all week." (Correction: "its" should be "it's" to indicate "it is.")
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"We are not certain who's textbooks these are, but we want to find out so that we can return them." (Correction: "who's" should be "whose" to indicate possession.)