Triple Chests

Question: There are 3 chests, labelled food, beds and food and beds.True enough, one chest contains only food, one chest contains only beds and one chest contains both. You are warned that the chests' labels may be lying collectively, or not at all. How can you tell which chest contains what by just opening one of them?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What can be broken but never forgotten?

Question: What gets broken without being held?