Choose the correct options to complete the sentences

1. I
   [was|had been]
   speechless as I
   [didn't see|hadn't seen]
   anything like this before.
2. Charles
   [didn't go|hadn't gone]
   to the cinema with us yesterday because he
   [already saw|'d already seen]
   that film.
3. I
   [was|had been]
   to that camp three times before they
   [closed|had closed]
   it.
4. The show
   [already started|had already started]
   when we
   [arrived|had arrived]
   , so they
   [didn't let|hadn't let]
   us in.
5. I
   [knew|had known]
   exactly what to do because I
   [did|had done]
   it many times.
6. I
   [came|had come]
   home and
   [went|had gone]
   straight to bed. I was exhausted.