Can You Solve?

So I have some riddles/puzzles/sequences that you can solve for some extra entries on giveaways. You can either use the extra entries right away or you can do rollover entries. Rollover entries is where you can save it and use it (only ONCE though!) for any upcoming giveaways that I may have. You can do one, two or all three of the puzzles.

For two extra entries (+2) solve this sequence.
O, T, T, F, F...
What are the next three letters?

For another two extra entries (+2) solve this puzzle.

1
11
21
1211
111221
312211
...

Continue this sequence for the next three lines.

And finally for an extra three entries (+3), solve this riddle.
Now! I will a rhyme construct by chosen words the young instruct...
What is this sequence?

Email me the answers and comment on THIS post once you've done so. When the answers are cleared by me (meaning if they are correct) please tell me which giveaway you would like to use it for by commenting on THAT post that you correctly solved the sequences.

This should entertain you guys (hopefully!) while I'm away :D