The del key is short for delete and it'll delete something if highlighted, to undo it just go to edit and hit undo on the word document!
J.K. Rowling is the author of Harry Potter
(that's what she is known for)
hope this helps
B adjective phrase is the correct answer
A MOOC is a massive open online courses. Believing the hype is something I cannot answer for you. It is an opinion, and it is yours to answer.
