2.  You have to complete minimal pairs
depending of phoneme.
 Ex : fool /u:/ /U/= full

3. /u/ /U/
 Suit  _______
 ______  Look
 Stewed  _______
 Pool  _______
 _______  Cook
 _______  Should

4. /ou/ /Λ/
 Phone  _______
 Bone  _______
 _______  Rum
 _______  Bust
 Tone  _______
 _______  Cut
 Hole  ________