Answer:
1. When I turned on the radio, the news <u>had finished</u>.
2. When we got home, we saw that somebody <u>had broken</u> the kitchen window.
3. By the time we arrived, the store <u>had closed</u>.
4. My friend called to tell me that I <u>had forgotten</u> my wallet in his car.
5. When we left home, it <u>had stopped</u> snowing!
6. They recognized me because I <u>had not changed</u> at all.
7. We didn't get a table in the restaurant because we <u>had not made</u> a reservation.
8. When Janet went back to the hotel, she <u>had bought</u> some souvenirs.
9. By the time I gave you back the book, I <u>had read</u> it carefully.
10. Tina felt nervous during her flight because she <u>had not flown</u> before.
11. The movie <u>had not started</u> when we got to the theater.
12. <u>Had</u> your brother <u>eaten</u> breakfast when he left?
Explanation:
Past perfect tense is primarily employed to display 'the actions that occurred in the past before a further action took place.' It assists in clarifying the time of action by telling which occurred before. It is formed by using 'had + Past participle form of the verb' that denotes the previous action(in the past) while the latter is written in past indefinite. Thus, the given sentences are completed by using this rule.
