It means that they are so familiar with the song that they could revise it identically - in simpler words, they can sing it without any mistake.
<span>C. We should always remember the people who died at Gettysburg.
Lincoln is saying that people in the future will forget what people said there, but they should never forget what people did there--they gave their lives for the fight and should be honored and remembered forever. </span>
All a diary entry is is when you start a story by making it sound appealing to the reader. It makes the reader want to read on, and not stop until the end.
B because it is the only reasonable amount of times you could do. The other answers are way to long or way to short.