They also learnt ...

 "I'm dr...

 "You villain...

 Cough mixture the...

 The Pet Puppy

 The Cat-Burglar

 Dinner Time

 Madame Tabby'...

 If People Keep Ba...

 De Avonturen van ...

 Terrier V.C.

 Labrador

 Two Round Eyes, O...

 A Young St. George

 Over the Old Tomb...

 Restored to the B...

 He Became A Veget...

 A Puzzle for Puss

 Hear The Horn!

 Then He Was Content

 Old Tom

 I Dreamt a Strang...

 Horror!

 Die, Peter!