I am sure that Laura's latest play, ________ staged, will prove a great success.
| A．since | B．unless | C．once | D．until |
I never thought anyone would speak ill of him to his face, _________?
| A．did I | B．didn’t I | C．would they | D．wouldn’t they |
Liu Yang has gone down into history because she is the first Chinese woman ________ in space.
| A．traveled | B．having traveled |
| C．has traveled | D．to travel |
President Obama and visiting Chinese president Xi Jinping held talks on a private property, _________ the first official meeting since the two countries changed their leadership.
| A．marking | B．to mark | C．marked | D．to be marked |
While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.
| A．is tried | B．are tried |
| C．has been tried | D．have been tried |
Talk to anyone in this country ________ you will find education and food safety are the problems of top concern.
| A．thus | B．or | C．then | D．and |