In this sentence convention would mean a way in which something is usually done
1.A hurricane was coming, so everyone boarded up their windows and bought supplies
2.thomas Jefferson was a philosopher with a greath mind:In fact, he invented many devices
3.Robert, carol and tim's friend, is a wonderful cook and he often invites them for brunch
4.the inca people lived in what is now Peru, building machu picchu
5.it's very hot this week,so we're using the air conditiong a lot, even if it is expensive
Answer:
you got it right it perfectly fine
