Riddles Part 1

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Across
  1. 3. What English word has three consecutive double letters?
  2. 4. What is so fragile that saying its name breaks it?
  3. 6. What word in the dictionary is spelled incorrectly?
  4. 8. Riddle: If a red house is made of red bricks, and a yellow house is made of yellow bricks, what is a greenhouse made of?
  5. 9. What can fill a room but takes up no space?
Down
  1. 1. What kind of room has no walls or corners?
  2. 2. What four-letter word can be written forward, backward, or upside down, and can still be read from left to right.
  3. 4. What can travel around the world without moving from its corner?
  4. 5. What can you catch but never throw?
  5. 7. The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?