________the population of China is the largest in the world.
| A．It is well known that | B．As is well known |
| C．Which is well known | D．That is well known |
----Have they finished the project?
---- Yes. By the end of last month, they ______ it. Now they ______ on a new one.
| A．had finished; are working | B．had finished; work |
| C．have finished; are working | D．have finished; work |
She really impressed me a lot for I had never heard ______voice.
| A．the more beautiful | B．a most beautiful |
| C． a much beautiful | D．a more beautiful |
Every year _______ students attend the college entrance examination, and ______ them can be admitted into their ideal universities.
| A．a quantity; many | B．a quantity of; a good many | C．quantities of; many of | D．quantities; a good many of |
It’s really a pity that the heavy rain ______ to go for a picnic.
| A．made it impossible for us | B．made that impossible for us |
| C．made us impossible | D．made it impossible of us |
_______ we were studying abroad, we learned much about foreign culture and customs.
| A．Since | B．While | C．After | D．During |