What does a person use to fight off disease? - immune system - name - one head - grip - fingernails  The best answer is
immune system

He had to try to make the call in the middle of the night, it was hard to communicate using only a what? - communicating - response - yelling - hanging up - whisper  The best answer is
whisper

What would use an account book? - desk drawer - purse - bank - keep accounts - keep track of emails  The best answer is

bank