Question

2. Мы выполнили работу в срок, хотя...

Answer 1

Мы выполнили работу в срок, хотя это потребовало больших усилий.

Answer 2

Хотя многое потеряли
...

Answer 3

I think you are asking me to answer in detail the following question: 2. We completed the work on time, although...

According to the web search results, the most common answer to this question is:

We completed the work on time, although it required a lot of effort.

This answer implies that the work was challenging or demanding, but the speakers were able to overcome the difficulties and meet the deadline. The word "although" introduces a contrast between the two clauses of the sentence.

If you want to learn more about the grammar and usage of the word "although", you can use Google Translate to translate the question and the answer into English or another language of your choice. You can also search for more examples and explanations on the web. I hope this helps.