Correct my sentences day#5

Hello! Asking for kind help in checking my sentences:

1.) The cat jumped out of the window - 猫は窓の外に飛びました
2.) The colors of the rainbow are beautiful - 虹の色が美しい
3.) I’ll never forget your smile - わたしは微笑を決して忘れる
4.) Learning kanji is difficult - 漢字は難しい学ぶです
5.) That little girl is very lively - その女の子はとても元気です

Thanks!