There is something wrong with this bill.Please all the items again.
—Are you a volunteer now? —No, but I _____. I worked for the City Sports Meeting last year.
The girl looked at me with a _______expression. Maybe the problem was quite ______.
A quarrel _________, which made him ______ his family.
Our class _______ of thirty-two boys and twenty-three girls.
Now a lot of new technologies can ______ problems in industry.