Ms. Frizzle's upset that she can't seem to get any marking done. There aren't enough hours in the day, evidently. Ms. Frizzle's preferred form of procastination appears to be house cleaning.
I think it was Quentin Crisp who said cleaning was a waste of time. He suggested that after the first two years, the dirt doesn't get any worse. Despite a lifelong aversion to cleaning, I've found that papers seldom, if ever, mark themselves.
Here's a tip--since Unity's seen fit to commit you to a building assignment for the rest of your life, keep an eye out for one in which you'll be able to mark papers.
And remember, if you don't like your assignment, be sure to do a terrible job so you won't be asked back
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