Of all the works Stevenson has written, Treasure Island is probably his _______ work.
He had a lot of friends, only a few of ______ invited to his wedding.
.Slang words (俚语) are made _____ special groups,such as workers and musicians.
. —Have you finished your composition? —Yes, I _____it in twenty minutes.
It’s important that he_____ English well.
I’m sorry that I can’t help _____ trees because I am busy with the homework.