—Have you ever been to Singapore?—Yes, I ________ there three times in 2009 alone.
We don’t have to keep these old chairs any more. ________, they are falling apart(支离破碎).
—I’m surprised to hear that Sue and Paul have ________.—So am I. They seemed very happy when I last saw them.
Nowadays school bus safety has drawn much attention nationwide for children’s safety is _______ worries parents most.
—What is the price of gas these days? —Oh, it ____________ sharply since last month.
If you are going to stay in the United States for longer than a(n) ______ visit, you may be interested in learning more about its people and culture.