1. 1. a chest
2. a blood
3. a disease
4. a pain, хотя тут все слова так или иначе связаны
5. an accident
6. a nurse
7. a heart
2. 1. I didn't watch the film because I had seen it.
2. She felt ill because she had eaten too much.
3. We couldn't drive to Liverpool because our car had broken down.
4. He hadn't finished his homework, so he couldn't go out.
5. "Why was he so hungry?"-"Because he hadn't had lunch. (ага, странно звучит, но это так)
6. I had bought the tickets before I heard you were ill.
7. He couldn't go out because he had promised to help his mum with the house work.