The BRICS countries have____ to be a source of global economic development and essential to generations.
| A．turned out | B．picked out |
| C．put out | D．taken out |
If he_____his teacher' s advice, Asafa Powell would not be the fastest man in the world.
| A．didn't follow | B．wouldn't have followed |
| C．hadn' t followed | D．hasn' t followed |
So suddenly _____ that the animals in the zoo looked very frightened during the total solar eclipse ( 日全食).
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
I wanted______cold meat but there was ______ left.
| A．some more ; no one | B．any more ; nothing |
| C．much more ; neither | D．some more; none |
It is global warming, rather than other factors,_____ the extreme weather.
| A．that have led to | B．which has caused | C．which are causing | D．that has led to |
_____ the crisis of economy getting more and more serious, the government is searching for ways to improve people' s life.
| A．As | B．With | C．When | D．If |