By careful observation and precise calculation, Nicolaus Copernicus _____ that there is no one center in the universe and the sun is the center of the solar system.
| A．believed | B．thought | C．concluded | D．imagined |
From their _____on the top of the TV Tower, visitors can have a better view of the city.
| A．stage | B．position | C．condition | D．situation |
—He says that my new car is a ____________ of money.
—Don’t you think those words are just sour grapes?
| A．lack | B．load | C．question | D．waste |
The World Health Organization gave a warning to the public without any______when the virus of H1N1 hit Mexico in April, 2009.
| A．delay | B．effort | C．schedule | D．consideration |
In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
| A．signal | B．chance | C．mark | D．measure |
My ______ of this weekend’s activity is going out with some good friends.
| A．idea | B．opinion | C．mind | D．thought |