Impressive. You are doing pretty good already. But however, the more accurate way to simply express should be:
??????????????????????

Please switch all ?? to (Mandarin) because Chinese don’t use ?? in their daily life. The only time they will use is ?? but not ?? ?: Chinese Pinyin). On the other hand, if you can’t have a correct tone when you pronounce ?? in Mandarin it will sound the same as ??. ?? which is Korean.

&?
I saw many people confusing among these two words. I guess it has something to do with your tutor.
In Mandarin, ?? means an answer to a difficulty or problem. ?? is a way or manner of doing something. Such as, the way I put “pu tong hua” seperated as three words was the same way as yours before.
??&??use interchangeable in Mandarin sometimes, it really depends on when you are using it.
In Shanghai dialect, in most circumstances we use & as the same. But if you speak in Mandarin that will make a big difference.
In this sentence, it will be more accurate to use ?? instead of ??.

*Regarding about Putonghua, I believe they put it together for people to understand it as one word conveniently. They shouldn’t have done that because people could make a wrong pronunciation without checking a dictionary. Obviously, these three words have different meaning.
?means universal
?means popular
?means language
So now you know why we call it ??? is because we’d like to have one universal language throughout the country to make it very popular so that everyone can communicate well. They are three words, not one.

Please don’t mind me correcting you. Now you learned something from me, good for you :-) I’m not perfect at English, you could find something wrong one or two. Free to speak.