Peer critiquing can be intimidating, but the confidence they have ...

[Kikoku]

Peer critiquing can be intimidating, but the confidence they have in each other and their drive to improve helps
  them use criticism constructively.
  An antonym for peer is
 
  a. brother
  b. sister
  c. comrade
  d. superior

Question 2

We sneak into each other's classrooms as often as we can' to watch each other teach to learn from each other and
  give honest feedback, Mulvihill says.
  A synonym for feedback is
 
  a. comment/observation/criticism
  b. complication
  c. lecture
  d. homework assignment

[bitingbit]

Answer to Question 1

d. superior

Answer to Question 2

a. comment/observation/criticism