How illiterate are you?

Check your literacy levels. Can you spell worth crap? (Be aware that this quiz uses English spelling rather than American because it's more widely used and it's also correct)

1 A false story circulating about someone is a...?
2 It's raining outside how bad is this...?
3 A place to borrow books from is a...?
4 The middle ages were positively...?
5 To put the wrong letters in a word...?
6 An additional benefit or advantage is a
7 An absence of air and a type of cleaner is a