Guessing

123456
Across
  1. 2. Polite and respectful toward other people
  2. 4. To shout loudly in a high, sharp voice
  3. 5. The opposite of polite
Down
  1. 1. become or make something greater in number or amount
  2. 3. The rules of polite behaviour in society
  3. 6. Worth a lot; very useful or important