A or AN ?
 

Exercise 9

C     an ice-cream
D     a banana
E     a bicycle
F     an egg
G     an umbrella
H     a key
I      a train
J     an office
K     a pen
L     a camera
 

Exercise 10

A      Champagne is a French drink.
B      A  Rolex is a Swiss watch.
C      Oxford is an English university.
D      English is an international language.
E      Milan is an Italian city.
F      A Mercedes is a German car.
G      A Pentax is a Japanese camera.