He became angry thus changing the mood of the story
Two benefits of a cloud-based system are data backup and collaboration.
:)
I'm sorry but there is not enough material for me to answer your question
Expository writing communicates fact based information, while a narrative tells a story.
The technique that this sentence best illustrates is understatement.
Understatement means that you are not showing the full 'strength' of something, but it is rather understated - so here, the coach only said that 'he was glad' even though his team won the Super Bowl, which is a huge deal. So his emotions should have been way stronger.