The first sounds like something from one of the Star Wars movies.
Correct:
The Empire Strikes Back. Was basically the opening lines to the start of the Battle of Hoth.
Two, I'm pretty sure, is Return of the Jedi.
Correct. It was Wedge's warning to the remaining fighters of Red and Gold Squadron when they entered into the Death Star's superstructure.
Three is from the Lord of the Rings Trilogy. Its one of the first two, but I'm not sure which one. I'm gonna go with the first.
Yes and No. Its from the Rankin Bass version of
The Return of the King, not the live action version, and deals first with Gandalf trying to stop The Witch-King from entering Minas Tirith and the second is Eowyn's demand to stop The Witch-King from seizing the dying Theoden on the Field of Pelennor. Sadly, both of these famous exchanges were cut from PJs version and the most egregious was Eowyn's as it robbed her character of her one moment of heroism in facing The Lord of the Nazgul. Its ironic that the cartoon version cleaved far closer to the book, but suffered from a small budget in the early 80s, yet the multi-million dollar live action version monkeyed around with Tolkien's work and made it almost unrecognizable.