Start out right away, ________ you’ll miss the first train.
| A．and | B．but | C．or | D．while |
—Mr Johnson, _______ a second chance, I will finish the task as planned.
— OK, don’t let me down this time.
| A．giving | B．given | C．to give | D．give |
_______ human beings use it in a wrong way, like we did with nuclear technology, the advancement of science and technology has never led to decline of human development.
| A．While | B．Unless |
| C．As long as | D．Before |
—I’m afraid the project may be several days behind schedule due to bad weather.
—Don’t worry. Three more assistants will be _______ in no time at all.
| A．at your convenience | B．at your command |
| C．at your risk | D．at your request |
Ding Junhui plays _______ Gary Wilson in the semifinal of the 2015 World Snooker China Open in Beijing, April 4, 2015.
| A．over | B．for | C．against | D．with |
—Mum, Dad ought to stop working?
—Yes, he has a bad headache because he _______ too long.
| A．read | B．has been reading |
| C．had read | D．is reading |