Complete the sentences.Use the correct form of the past perfect simple.

She was unhappy because she (not enjoy) _______ her holiday.
When I got to the beach, they (already eat) _______ the sandwiches.
We arrived late at Kate's party because we (miss) _____ the bus.
(the exam start) _____ by the time you arrived ? 
After he (finish) _____ the washing-up, he went out.