People from all over the world ________ China on the successful launch of Chang’E-1.
| A．celebrated | B．greeted | C．congratulated | D．enjoyed |
_________ for the free tickets, I would not have gone to the films so often.
| A．If it is not | B．Were it not | C．Had it not been | D．If they were not |
I think they failed to accomplish the task, ______?
| A．do I | B．don't I | C．did they | D．didn't they |
You might as well expect a river to flow backward ____ us carrying out the plan.
| A．than stop | B．as to stop | C．as stop | D．so as to stop |
________had the worker who was badly injured in that accident stopped breathing and died________ doctors arrived.
| A．Almost; when | B．Hardly; when | C．Not; until | D．Hardly; before |
So fast _____it is difficult for us to imagine its speed.
| A．does light travel that | B．light travels that |
| C．as light travels that | D．with light travels |