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Please make sure that no details _____ before you deliver a speech.
| A．would be overlooked | B．will overlook |
| C．are overlooked | D．are overlooking |
—Your colleague is speaking English with fluency.
—It's no wonder．She ____ in the UK for a year as a visiting professor
| A．worked | B．has worked |
| C．had worked | D．has been working |
Tony ____ for the company as an engineer for two decades. Now he teachesmechanics m Peking University.
| A．has worked | B．worked | C．is working | D．had worked |
They in Holland for ten years. Now they have settled down in Paris.
| A．lived | B．have lived | C．had lived | D．were living |
Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
| A．showed | B．will show | C．has shown | D．is showing |
Great Changes ________in Shanghai since 2000.
| A．have been taken place | B．took place |
| C．had taken place | D．have taken place |