question: if you want to convert some part of audio from the ogm file, drag the slide bar directly, or click the play button to preview the media file, set the start time and the end time. at last, click the convert button to start to convert ogm to mp3.
Capitalize this past sentence correctly.
A: If you want to convert some part of audio from the ogm file, drag the slide bar directly, or click the Play button to preview the media file, set the Start Time and the End Time. At last, click the convert button to start to convert ogm to mp3.

question: hot air 30 c to 230 c can be combined with chosen humidity level of 0%, 30%, 60%, 80% or 100%
Capitalize this past sentence correctly.
A: Hot air 30 C to 230 C can be combined with chosen humidity level of 0%, 30%, 60%, 80% or 100%

question: a user is defined as one personalized email address (you@yourcompany).
Capitalize this past sentence correctly.
A: A user is defined as one personalized email address (you@yourcompany).