1.spare (pass doesn't apply, waste has a negative connotation, spend doesn't match the "keep them so busy" vibe)
2.rule (set and test don't apply and the previous sentences didn't really describe a case)
3.dedicate(contribute involving giving something, reserve means to keep, "involve themselves" sounds off)
4.provide(offer involves a bargain or terms for both sides rather than just Ava's, donate involves a cause that Ava has yet to mention, and you normally wouldn't have the word with right after giving something)
5.coverted(normally, you'd say substituted for, not into. adapted normally deals with atmosphere or environmental situations. exchanged normally requires a deal which was not made)
6.amount(degree is used to measure but what? nothing was specified before considerable. extent is an adjective essentially so you end up with "considerable extent" but of what? deal does not apply)
7.means(chance doesn't apply, Tim's not doing it by chance. Kind is too vague and not necessarily applicable. and possibility doesn't apply since he didn't list any other ways of raising for charity.)
8.combine(adjust doesn't fit, join normally isn't used this way, and merge isn't normally used this way either)
Note: the options are bad, many of them have synonyms turning it into an opinion-based homework
