The correct translation of the Turkish sentence is "Significant discoveries had been made by researchers." as it describes past actions that were completed before another past event.

The correct translation of the Turkish sentence is "For two months, she worked out every day at the gym." as it describes a completed action in the past.

The correct translation of the Turkish sentence is "The previous version of this software had been developed for a long time." as it expresses a past action that was ongoing for a long period before another past event.

The correct translation of the Turkish sentence is "I was watching TV while the meal was being prepared." as it indicates two simultaneous actions that were taking place in the past.

The correct translation of the Turkish sentence is "I took photos throughout the day-long events." as it indicates a completed action in the past during the day-long events.

The correct translation of the Turkish sentence is "I passed the exam yesterday." as it indicates the completion of the action in the past.

The correct translation of the Turkish sentence is "Concert tickets sold out quickly." as it describes a completed action in the past.

The correct translation of the Turkish sentence is "We had been working on the new project." as it indicates a past action that was ongoing before another past action or event.

The correct translation of the Turkish sentence is "The room was cleaned, and she was still not sleeping." as it describes a completed action (cleaning the room) and an ongoing action (not sleeping) in the past.

The correct translation of the Turkish sentence is "Last night, a lunar eclipse occurred." as it describes a completed action in the past.

The correct translation of the Turkish sentence is "The paintings were displayed in the museum." as it indicates an ongoing action in the past.

The correct translation of the Turkish sentence is "In the past, I wrote articles for many magazines." as it describes a completed action in the past.

The correct translation of the Turkish sentence is "They were working while listening to music when I entered." as it indicates an ongoing action that was taking place at the time the speaker entered.

The correct translation of the Turkish sentence is "While studying, my phone rang." as it conveys the idea that the phone rang while the speaker was in the midst of studying.

The correct translation of the Turkish sentence is "It had been raining all night." as it expresses a past action that occurred continuously before another past event.

The correct translation of the Turkish sentence is "New ideas came while writing the novel." as it describes a past event that happened during the process of writing the novel.

The correct translation of the Turkish sentence is "She found her cat while she was looking for it at the corner store." as it describes a past event that happened during the process of searching for the cat.

The correct translation of the Turkish sentence is "The new mobile phone model was launched last week." as it describes a completed action in the past.