He tried communicating by radio, but what did he hearing the other end? - static - progress - collaboration - confusion - sound  The best answer is
static

The dream was so terrible, what did the dreamer do? - reality - nightmare - park - dreamworker - awake  The best answer is
awake

What is likely to happen to a person in Washington State found guilty of stabbing someone to death? - imprisonment - capital punishment - killing - hurt - enlightenment  The best answer is
imprisonment