Do you often help your father ___ the farm work during the summer vacation?
So were you in what you were doing that I dared not make any sound when I came in.
Many western writers from poverty in their lives;it was because of this that they were able to write many masterpieces.
to take part in the international speech competition, you must make preparations for it ahead of time.
I the mistake the first time I went through the essay, for my mind was wandering.
I can't stand ______ with Jane in the same of-fice. She just refuses talking while she works.