Maria is fond of all kinds of sports, but she likes swimming ________.
.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.
—What led to his success ? —He succeed _____ working hard .