The author converts joy in the excerpt by using irony in the situation of it being so hot they have to fan themselves then, ironically they start singing a song titled heatwave
Excitement, should be the answer! I cannot tell much more because there is not much context. I hope you pass your exam, though :>
Answer: The Amazon River is the largest river system in the world because more than 1,000 creeks, streams, and tributaries drain into the river. Very few cities are connected by the river, so it is not a busy thoroughfare for large transport or industrial ships. Hope this helps! :)