Question

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Answer 1

IV.1. a) Past perfect is used to show that the action of entering the collection of cuddly toys happened before the action of opening the exhibition. (older: entered the collection; newer: the opening of exhibition)
b) Past perfect progressive is used to express that the boy started collecting rocks and fossils long before the exhibition was opened, but he was still collecting them at the time of the exhibition.
c) Past perfect is used to show us that the action of becoming notable and the action of winning the expert’s acclaim happened before the moment in the past when the story was told us. (sequence of tenses: the story is told, and all other events had happened before that moment)  
3. 1. I had been typing
2. she had cooked.
3. I had never played
4. he had watched
5. I had read it
6. they had been working
7. we had been living  

VI. went; I had read; I arrived; had already been queuing; I joined; opened; I realized; I had been standing; I hoped; disappointed; I had never seen; seemed; I spent; had meant; I was looking; stopped; began; answered; had been talking; looked; told; shook; had given; had found