Answer:
C. When possible, cook in the oven rather than on the stovetop,
A. Buy in single-serving sizes, which uses less packaging than bulk items.
Double variations appear during the Second movement of the Beethoven's Fifth Symphony.
6.
You can tell what key it is in by the starting note. Therefore, for example the first question is on "D", and it had a flat accidental. Therefore it is a Db (D flat). Now, we can use the circle of fifths
[first attachment]
to help find out where the sharps and flats fall, and since this is a major scale, the pattern is Wholestep Wholestep Halfstep Wholestep Wholestep Wholestep Halfstep (WWHWWWH).
Therefore the pattern is Dflat Eflat F Gflat Aflat Bflat C and Dflat again. You can write there as notes on the scale
[second attachment]
You can do this for the rest of question 6.
∆∆∆
7.
Just choose a key signature from the circle of fifths (an easy one is G) and put that key signature on your staff. Secondly, choose a time signature. The easiest is 4/4. If you're in "G", start in key of "G" and make a simple tune. e.g
[third attachment, scroll right]
for the other tunes, just choose different time signatures and key signatures and switch up the tune.
Hope I helped and good luck!