Choose the correct options

1. I saw
   [a|the|─] dog chasing
   [a|the|─] cat on
   [a|the|─] street.
2. [A|The|─] book that I borrowed in
   [a|the|─] library is interesting.
3. I know that
   [a|the|─] cars did not exist two hundred years ago.
4. My mother has
   [a|the|─] headache at least once
   [a|the|─] week.
5. My parents weren't happy to go to
   [a|the|─] school to talk to
   [a|the|─] principal.
6. I've always dreamt to go to
   [a|the|─] Bahamas.