Answer:
1. It rained all week; parts of the highway were flooded.
2. The audience roared with laughter; the comedian felt satisfied.
3. I spend eight hours a day in a windowless classroom; it's a relief to get out in the open air after school.
4. Jim never goes to that gas station anymore; he found out that he was overcharged for a valve job.
5. I loved the sweater my friend bought me; I wear it almost every day.
Step-by-step explanation:
Semi colons are used to separate sentences. It’s similarly to a period but the sentences HAVE to be related.