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I had a class test today. I want to clarify some questions.
1. Inspite of her being too young, they appointed her. Start with "Although"!
My answer: Although she was too young but they appointed her.

2.Fill up with prepositions:
i)The prince was the only heir ____ the large kingdom.
Answer: of
ii)The new manager gets _____ with his colleagues very well.
Answer: in

Please tell me if I was gramatically correct in all these cases. If there's a better option, never mind. But please tell me if I am right. I will be very happy!!!!!!!!!
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I'm sorry, but if I were your teacher, I would mark your sentence with the "but" as incorrect.

Generally, "heir to" but perhaps your teacher will allow "heir of."

He gets ALONG with his colleagues.

Also, just as a general point, if you are going to ask for our help with standard English, please use standard English in your request. "Gonna" (along with "wanna") are not good choices in this forum.
Comments  
1. Inspite of her being too young, they appointed her. Start with "Although"!

Your sentence sounds a bit weird to me. I would way "Although she was too young, they appointed her." or "Although she was too young, they nevertheless appointed her." And although I hear nevetheless in such contexts quite often, it is apparently superfluous.
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The "but" in your first answer is definitely superfluous. You could say, "Although she was too young, they still appointed her."

2 (i). depends on precise usage, but probably "to"

(ii) "on"
Is "Although she was too young but they appointed here" grammatically incorrect?
Is heir of wrong and the third one. Are they wrong? I know your suggestions are better!! But I need to know whether I am grammatically wrong?
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 BarbaraPA's reply was promoted to an answer.