question: did someone email you a qxt file and you're not sure how to open it? maybe you have found a qxt file on your computer and wondering what it's for? windows might tell you that you can't open it, or in the worst case, you might encounter a qxt file related error message.
Capitalize this past sentence correctly.
A: Did someone email you a QXT file and you're not sure how to open it? Maybe you have found a QXT file on your computer and wondering what it's for? Windows might tell you that you can't open it, or in the worst case, you might encounter a QXT file related error message.

question: this means, among other things, a high medium density, which is about 40 % higher than common spruce.
Capitalize this past sentence correctly.
A: This means, among other things, a high medium density, which is about 40 % higher than common spruce.

question: the academy trains specialists in all faculties in english, russian and ukrainian languages.
Capitalize this past sentence correctly.

A: The Academy trains specialists in all faculties in English, Russian and Ukrainian languages.