Complete the sentences with the correct form of make or do​

1. A lot of damage was done during the war.  

2. Everyone has to make a choice between either doing their best or giving up.  

3. The organization makes certain that everyone had a chance to complete.  

4. She did her duty with great bravery and rescued many of the wounded soldiers.  

5. Have you made a decision about which event you want to do?  

6. It won't make any harm if you try.