Ответ:

  1. A – B – F – C (C should come before F).
  2. O (the sequence is M, N, O; no odd letter is evident—this item appears unclear in the photograph).
  3. S – V – T – U (the sequence should be S, T, U, V).
  4. E – H – K – I (the sequence E, H, K is alphabetical by steps of three; I does not fit).
  5. P – Q – R – S (all letters are in the correct order).