_____the size of the universe, some researchers believe that there is life beyond our planet.
A. Consider B. To consider
C. Considered D. Considering
The trains leave every 15 minutes; if you miss ____ , you don’t have to wait long for another.
A. it B. this C. one D. some
Mr. Sawyer started his career at Stanford University, _____ he became Professor of Physics in 2002.
A. which B. where C. when D. that
–Peter, do you know how to download the new software?
–Certainly. I _____ you the steps.
A. show B. am showing
C. will show D. have shown
_____ you have any disagreement, we will carry out the plan next week.
A. Unless B. Though C. However D. When
The singer’s music video _____ nearly 9 million times since it was posted on the Internet four weeks ago.
A. viewed B. was viewed
C. has viewed D. has been viewed
