Answer:
7.She switched on the TV, sat down and watched a documentary.
8.They were having a break while they were playing football.
Explanation:
Past Simple Tense is used for an action completed in the past. It can also be used for the actions that happened several times in the past.
The characteristic timelines used with Past Simple Tense are:
yesterday, the day before yesterday, two years ago, four hours ago, the last month/year/ Friday...
Past Continuous Tense is used for the action that lasted a long time in the past It is also used for two actions that happened in parallel in the past. Another use is for past action that lasted longer and was interrupted by another past action. This second action is usually expressed in Past Simple Tense.