1. Waltz is music which can be played in an orchestra or alone at home and it is usually a great dance in special events.
2. You can make a fairly good sandwich with cheese, jam, tomatoes and, obviously, bread.
3. An orchestra is usually composed mainly by trumpets, guitars, one or two pianos, some drums and other percussion. Nevertheless, there are certainly much more instruments.
4. I wouldn't recommend punching a glass. You might cut your hand! But if you already did, you should throw some olive oil in the wound (not actually, it may not be a good idea, put on your jacket and go to the doctor!!)