Among Asimov's most famous works of science fiction, one _____he won an award, was the Foundation Trilogy.
The radiation of uranium was then regarded as_____secret of_____nature.
Would you like______ knife and fork,or would you rather use______ chopsticks,sir?
—Who came out______first in the London Marathon?—Michael.He’s always______first to reach the line.
Johnson had made up his mind to give it up,but on______second thought he determined to try______ third time.
Quickly!Tom,give me ______pen to mark the page.I see______under the book.