НУжно поставить в правильное время (the Past Simple or the Past Perfect Tense) очень
2. Last month we (went / had gone) to the conference in Kyiv.
3. (Did / had) they (give / given) lecture on Monday?
4. I (posted / had posted) the letter by that time.
5. We (translated / had translated) the text before we handled control papers to the teacher.
6. They (stayed / had stayed) in this hotel yesterday.
7. The boy (studied / had studied) English before he entered the university.
8. How many days (did / had) they (work / worked) last week?