How long ___ to finish the work ?
| A．will you take | B．will you take | C．you will take | D．will it take you |
_____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 |