Complete the sentences with a or an

1. This is
   [ ] very beautiful house.
2. I have got
   [ ] old bike.
3. We need
   [ ] apple,
   [ ] banana and some yoghurt for the fruit salad.
4. Can I have
   [ ] burger, please?
5. I want to watch
   [ ] interesting film.
6. This tower is
   [ ] historical building.