________ from space, the earth , with water_______ seventy percent of the surface , looks like a blue ball.
—This wall of air is an effective answer to the problem and it ______ work. —But it is a question to put such a wall of air around the statue.
—How do you think I should receive the reporter? —______ you feel about him, try to be polite.
Examination compositions, together with most business letters and government reports, are the main situations ______ formal language is used.
—Who is making so much noise in the garden? —______ the children.
I haven’t read ______ of his books, but judging from the one I have read I think he’s a very promising writer.