1. I wasn’t sure if my purchases ... or not and I didn’t know whom to ask about it. (to deliver)
2. Pam asked him why he his job. (to want, to leave)
3. He said that If I Kathrin, she me. (to ask, to help)
4. I was worried if enough space to buy a new TV set to my room.(I to have)
5. Anna explained to me that the hairdresser’s down the road. (locate)
6. Bill asked me what ... for dinner the day before.
7. He said that he ... that film.
8. Charles said that he ... me the following day.
9. Greg said that ... a new job.
10. Tim complained that he ... at four o’clock in the morning.

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1. I wasn't sure if my purchases had been delivered or not and I didn't know whom to ask about it.

Explanation: The verb "to deliver" is used in the past simple tense to refer to an action that happened and was completed in the past. However, in this sentence, we need to express uncertainty, which requires the use of the past perfect tense. Therefore, the correct form is "had been delivered."

2. Pam asked him why he had wanted to leave his job.

Explanation: The verb "to want" is used in the past perfect tense to show an action that happened before another past action. In this case, the action of wanting to leave the job happened before the action of being asked about it. Therefore, the correct form is "had wanted."

3. He said that if I had asked Kathrin, she would have helped me.

Explanation: This sentence is a conditional sentence in the past unreal condition. The verb "to ask" is used in the past perfect tense because it refers to an action that didn't happen in the past. The verb "to help" is used in the conditional perfect tense to express a hypothetical result. Therefore, the correct form is "had asked" and "would have helped."

4. I was worried if I had enough space to buy a new TV set for my room.

Explanation: The phrase "to have" is used in the past perfect tense because it refers to an action that was completed before the present moment. In this sentence, the action of having enough space happened before the action of being worried. Therefore, the correct form is "had."

5. Anna explained to me that the hairdresser's is located down the road.

Explanation: The verb "to locate" is used in the present simple tense because it refers to a general fact or a permanent situation. In this case, the location of the hairdresser's is a permanent situation. Therefore, the correct form is "is located."

6. Bill asked me what I had had for dinner the day before.

Explanation: The verb "to have" is used in the past perfect tense in order to show that the action of having dinner happened before another past action. In this case, the action of having dinner happened before the action of being asked about it. Therefore, the correct form is "had had."

7. He said that he liked that film.

Explanation: The verb "to like" is used in the simple past tense to express a completed action in the past. Therefore, the correct form is "liked."

8. Charles said that he would call me the following day.

Explanation: The verb "to call" is used in the future tense to express a future action. In this case, Charles is expressing his intention to call in the future. Therefore, the correct form is "would call."

9. Greg said that he had found a new job.

Explanation: The verb "to find" is used in the past perfect tense to show an action that happened and was completed before a past moment. In this case, the action of finding a new job happened before the past moment when Greg said it. Therefore, the correct form is "had found."

10. Tim complained that he had been woken up at four o'clock in the morning.

Explanation: The verb "to wake up" is used in the past perfect tense to show an action that happened in the past and was completed before another past action. In this case, the action of being woken up happened before the action of complaining about it. Therefore, the correct form is "had been woken up."