The difference between past simple or past continuous is not always clear. This is an exercise in which you need to choose between these two tenses.
The past continuous is used to talk about long actions in the past or when the focus is on the duration of the action. This is a mixed exercise.
The past continuous is used to talk about long actions in the past or when the focus is on the duration of the action. This is an exercise about forming questions.
The past continuous is used to talk about long actions in the past or when the focus is on the duration of the action. This is an exercise about forming it.
The past continuous (or past progressive) is a tense in English you use to talk about long actions that were going on at some point in the past.