Crossword for English camp

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Across
  1. 3. he is prophet Muhammad's friend who always call for prayer is ____
  2. 6. That always in front of you but can't be seen?
  3. 7. the topic of debate in English debated are called ____
  4. 8. rebuttal from opposing team is ____
  5. 9. if I have it, I don't share it. If I share it, I don't have it. What is it?
Down
  1. 1. we must care about _____ for the next descendants future
  2. 2. I can fill a room but I take up no space. What am I?
  3. 4. it has keys, but no locks. It has space, but can't go inside what is it?
  4. 5. _____ makes perfect
  5. 8. overview the debate is job for ____ speaker