Sure, here are the correct forms of the verbs in the past simple or past perfect tense to fit the context of each sentence:

1. The robbers **had left** the bank when the policemen finally **arrived**.
2. When the rain **started**, the Atkinsons **had finished** planting trees.
3. By the time Rebecca **went** into the store, she **had got** soaked.
4. Darcey **had seen** this castle before she **came** again last Sunday.
5. Mr. Palmer **hadn't spoken** any Chinese before he **moved** to Peking.
6. Sonny **had got** fainted by the time the ambulance **reached** the hospital.
7. When my mother **brought** me an apple, I **had finished** my homework.
8. Mrs. Wilkinson **refused** to drive the car because she **had had** a terrible accident on the highway about a year ago.
9. I **hadn't thought** of having a new house before I **saw** that ad on TV.
10. My uncle **hadn't tried** Italian food before he **went** to that restaurant.

These choices ensure that the sequence of events is clear and logical, with the past perfect tense indicating actions that were completed before another action in the past.