What is the function of idioms and proverbs in sentences​

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What response does lincoln hope to elicit from his listeners with these words from his gettysburg address "we gave to come dedicate a portion of that field, as a final resting place for those who here gave their lives, that that nation might live. it is altogether fitting and proper that we should do this

Which sentence uses the word they’re correctly? a. how do they know that it’s they’re package? b. they’re going to the beach next weekend. c. which is they’re house? d. have you been they’re before? hurryyy