If you had put them there already then those are correct
You are Malvolio. Malvolio gets a letter from who he thinks is the wealthy countess Olivia, which suggests that she loves him. (It's a trick-people that he;s upset because of his snooty behavior have decided to spite him.)
So, t<span>he letter suggests that Olivia will show favour towards Malvolio and by doing that he will have greatness (high status) thrust upon him, and he is pleased to read this. </span>
While writing again, the girl kept checking the time because she feared that her time would be up before she finished.
"Like sparks from a blacksmith's window" refers to the sparks that happen when a blacksmith is working. The meaning depends on the context. The context should usually be something like anger, exploding anger, or it could be excitement...