You _______ make so much noise here.
You can't/mustn't make so much noise here.
I _____ sing well now, but I _____ sing well when I was a child.
I can sing well now, but I couldn't sing well when I was a child. / I can't sing well now, but I could sing well when I was a child.
3 Down: People need to eat foods with _____ in order to build muscle.
3 Down: People need to eat foods with protein in order to build muscle.