1. We launched the second version once we had seen/were seeing how successful the first one was.

 2. By the time he was applying/’d applied, the job had already gone.

 3. After he had invested/was investing more money, the business took off.

 4. He called while I tried/was trying to finish this essay.

5. The entrepreneur gave/had given another billion dollars to charity after he had already given three billion.

 6. We didn’t need to clean the house because he had already done/already did it.

7. I studied business in the evening while I was working/had worked in the kitchen.

 8. She left before anyone had had/was having a chance to explain the situation.

 9. The business went/was going bankrupt last month and they couldn’t save it.

10. All last year, the company had looked/was looking for ways to survive.

5. The entrepreneur gave/had given another billion dollars to charity after he had already given three billion.

 6. We didn’t need to clean the house because he had already done/already did it.

7. I studied business in the evening while I was working/had worked in the kitchen.

 8. She left before anyone had had/was having a chance to explain the situation.

 9. The business went/was going bankrupt last month and they couldn’t save it.