The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
| A．if | B．till | C．as | D．while |
【原创】 In 1884 the term“Junk”came to mean“old refuse from boats and ships”，and______ it came to mean“trash”in Western culture .
| A．automatically | B．terribly |
| C．gradually | D．eventually |
【原创】 Vehicles, coal-burning, airborne dust and industrial production ______85 to 90 percent of the major airborne pollution sources in most Chinese cities, the newest research shows.
| A．account for | B．call for |
| C．make up for | D．provide for |
【原创】 Green roofs have an ______effect, helping reduce the amount of energy______ to heat a building in winter and cool it in summer.
| A．isolated；needed | B．isolating；needed |
| C．isolated； needed | D．isolating；needing |
【原创】The hardest thing is to ______ less when you can ______more.
| A．get; take; | B．take; take; |
| C．take; get; | D．get; get; |
We need some more facts and figures we take the final decision.
| A．since | B．after | C．before | D．until |