__________ that it ranks 40 in the world .
A. So many talents has Tsinghua University produced
B. Such many talents has Tsinghua University produced
C. So many talents Tsinghua University has produced
—Why are your hands so dirty?
—I ____________in the garden.
| A．was working | B．have worked | C．worked | D．have been working |
If I can help ____, I don’t like working late into the night.
| A．so | B．that | C．it | D．them |
—Why not open the windows to let _____cool air in?
—I’d rather you didn’t. ________air in out town is terribly polluted.
| A．a; The | B．/; The | C．/ ;/ | D．the; / |
—Are my clothes too casual?
—No. You can go ____you are.
| A．as | B．what | C．that | D．where |
How ___I help them to understand when they won’t listen to me?
| A．can | B．would | C．may | D．must |