The teacher tried to explain the phenomenon to his students, but his meaning didn’t really_____.
| A．get down | B．get across |
| C．get over | D．get in |
According to the law, all foreigners have to________with the local police within two weeks of arrival.
| A．associate | B．dispute | C．negotiate | D．register |
Old－fashioned phones matter when wireless networks ________ in disasters.
| A．turn down | B．turn out |
| C．break down | D．break out |
While intelligent people can often________the complex, a fool is more likely to complicate the simple.
| A．sacrifice | B．substitute | C．simplify | D．survive |
As the train ran faster and faster，the lights of the city were soon ________.
| A．left off | B．left alone |
| C．left behind | D．left out |
At the edge of the grass，there's a sign saying“________ the grass”．
| A．Keep up | B．Keep away |
| C．Keep off | D．Keep back |