Did you solve it? Are you smarter than a metagrobologist?

The solutions to today's two puzzles

Both questions today were sequence puzzles. In the first case you had to work out the letter than came next, and in the second you had to decipher the pattern.

1)

I don't know why, but most of us get a perverse pleasure out of making up sequence puzzles. While invigilating an exam, I was reading a puzzle book and the following pattern occurred: SENT. I then realised that this can be continued as: SENTTTTTTTTTTTTTTTTTTTT. What is the next letter?