Finish the second sentence so that it has a similar meaning to the first one without changing the given words

Finish the second sentence so that it has a similar meaning to the first one without changing the given words.
Question 47: He is the man most likely to win the race.
    No one stands a___________________________________________________.
Question 48: I can't describe people as well as you can.
   You are__________________________________________________________.
Question 49: More people are infected with HIV this year than they were 5 years ago.
  Not as many people_________________________________________________.
Question 50: Peter is a better mechanic than Jim.
 Jim is not__________________________________________________________.