You are missing "we", "you" plural, and "they". For the verb "хоте́ть" (the infinitive of "хочешь"), take a look at https://en.wiktionary.org/wiki/%D1%85%D0%BE%D1%82%D0%B5%D1%82%D1%8C#Russian and click the [show] option on the line "Conjugation of хоте́ть (class 5c' imperfective intransitive)"
I get the impression that Duolingo thinks all one letter mistakes are minor spelling mistakes. They don't seem to have excepted case endings from this "one letter wrong is ok" policy.
The only solution I've found is to open the discussion page every time that I have the slightest doubt.... Not very efficient.