Whoever leaves the lab last, _____ all the lights are turned off.
| A．make sure | B．make sure of | C．be sure | D．be sure of |
Most people ____ material possessions.
| A．chase away | B．chase after | C．chase about | D．chase down |
He got to the station early, ____ missing his train.
| A．in case of | B．instead of | C．for fear of | D．in search of |
Scientists are confident that they can make lasers which can ____ missiles.
| A．knock down | B．knock out | C．knock into | D．knock off |
It’s interesting to contrast the British legal system ____ the American one.
| A．with | B．to | C．by | D．from |
Don’t be worried about the small fire in that field. It won’t be long before it ____.
| A．burns up | B．burns down | C．burns out | D．burns away |