The sign says that children are admitted only if ________ by an adult.
_____the size of the universe, some researchers believe that there is life beyond our planet.
The trains leave every 15 minutes; if you miss ____ , you don’t have to wait long for another.
Mr. Sawyer started his career at Stanford University, _____ he became Professor of Physics in 2002.
–Peter, do you know how to download the new software?–Certainly. I _____ you the steps.
_____ you have any disagreement, we will carry out the plan next week.