Do you think it is _______ useful book—Yes. I got _______ “A” in my writing exam last week after I read the book.

By the time he arrived at the airport, the plane .

If we________develop the world successfully, we must make sure that everyone is able to take part in the new world we create

Construction workers usually get ______ by the day

was no hard evidence, most people thought he had broken the window of the classroom.