Complete with AN or A:

There is   _   a   an   green English book on the desk.

He is drinking   _   a   an   cup of coffee.

A lion is   _   a   an   animal.

Bart Simpson is   _   a   an   child.

What's the Nile? It's   _   a   an   river in Africa.

My older brother is   _   a   an   teacher in London.

  _   a   an   apple a day keeps the doctor away.

It is raining today, you should take   _   a   an   umbrella.

Is your mother   _   a   an   nurse ?.

London is   _   a   an   old city,