He visited the Effel Tower, which __________to 1889, during his stay in France last summer.
| A．dated back | B．dates back |
| C．has dated back | D．has been dated back |
— Can the project be finished as planned?
— Sure. it completed in time, we’ll work two more hours a day.
| A．Get | B．To get | C．Getting | D．Got |
Don’t litter in the street in Singapore, you could be arrested.
| A．or | B．and | C．but | D．so |
In the past several weeks, many cities in Northern China from heavy fogs and severe cold.
| A．had suffered | B．have been suffering | C．were suffered | D．suffered |
she was out of the room, he took a quick look at the papers on her desk.
| A．If | B．While | C．Though | D．Unless |
Visitors to the hills are greeted by signs them to look out.
| A．warn | B．to warn | C．warning | D．warned |