Answer:
8....
9. The time signature is used to know how many beats are contained in each measure, and which note value is equivalent to a beat.
10. 4 beats per measure
11. it's just the measure that u repeat from the starting at the first double bar line (the first double bar is on the left side of the measure, the second on the right. ...There no name for it
12. Allegro there are many Italian musical terms that describe or direct the tempo, or speed, of the music, and allegro is one of these. The word means cheerful.
Sorry, I don't know 8:(