A, an and 'one'

'A' and 'an' are a bit different from the word 'one'. 'One' is a number and it means 'one', not 'two'. 'A/an' also mean 'one', but when the exact quantity is not really relevant. Please, complete the following exercises:

• Very easy a/an exercise.
• Easy and short exercise.
• Easy exercise.
• Another easy exercise.
• Easy, but a bit long exercise.
• This exercise is long and contains exceptions. It's up to you!
• Complete with 'a', 'an' or ... nothing (!).
• A difficult execise: a, an or one. It's hard and it has got difficult vocabulary.

Ok, ready? Now... take the TEST.