When we sleep is cultural as biological-and practices differ greatly round the globe.
| A．that much | B．so much | C．too much | D．as much |
The real evidence is the least of our worries ______ we have known about it.
| A．since | B．though | C．unless | D．while |
Everyone present certainly thinks there ______ be a total ban on cigarette advertising.
| A．would | B．could | C．should | D．might |
In the lecture, the professor told his students how to write an ______ of a graduate paper, expressing the main argument.
| A．account | B．abstract | C．application | D．address |
Not many of us really get to see the hard work that happens ______ the scenes to make our favorite movies come to life.
| A．without | B．to | C．behind | D．by |
For nearly ten years, he ______ very few interviews or concerts. His simple life might have continued but for the great musician.
| A．did | B．has done | C．does | D．has been doing |