It was about 600 years ago __________ the first clock was made.
| A．that | B．until | C．before | D．when |
It may not work out that one living in an English-speaking country will acquire the language ________.
| A．effectively | B．fluently |
| C．automatically | D．severely |
An ideal job should be one that _____ what you are good at with what you are interested in.
| A．combines | B．connects |
| C．contacts | D．concentrates |
Several underground stations are under construction at the same time these days, ________ the rush hour traffic even worse.
| A．to make | B．makes | C．making | D．made |
According to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.
| A．increased | B．had increased |
| C．had been increased | D．was increasing |
When the news came that China’s football team ranked ________ 2nd and qualified itself for ________ 2nd round, we all jumped up with excitement.
| A．the; the | B．the; a | C．/; the | D．a; / |