They eat less sugar and that’s ______ they have ______ white teeth.
| A．because, healthy | B．why, health |
| C．because, health | D．why, healthy |
As is known to all, Montreal is the second largest French-speaking city in the world, _____.
| A．Paris is the largest | B．Paris the largest |
| C．Paris to be the largest | D．Paris be the largest |
Chinese vessels ________ 646,000 square kilometers in the southern Indian Ocean in search of the missing Malaysian flight MH370.
| A．have covered | B．have looked |
| C．have travelled | D．have reached |
Some experts say _______ birthrate of Chinese, after the one-child policy is relaxed, can see _______ modest increase in future.
| A．the; a | B．a; a | C．a; / | D．the; the |
The government will begin a series of to help the public fully understand the new educational system.
| A．expectations | B．occasions |
| C．presentations | D．assumptions |
Over the past decades, the population in this countrybecause of the rising birth rate, immigration and the declining death rate.
| A．has been increasing | B．have been increasing |
| C．had increased | D．have increased |