Fill it up

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Across
  1. 2. One can write using me.
  2. 4. People use most of the times before game to decide choice.
  3. 5. winner who comes with suffix ion will be called like this.
  4. 7. I can protect head, wear me on head.
  5. 8. I am number who will be called as boundary in cricket.
Down
  1. 1. When I come to you, you should use me or else I may go forever.
  2. 3. People use me when they agree with something.
  3. 4. Guides his students.
  4. 6. I stay high on your head.You can see me completely only once in the month.