____ the temperature falling so rapidly, we couldn't go on with the experience.
| A．Since | B．With | C．As | D．For |
So tired __________ after walking such a long way that I ___________ stand.
| A．was I; could hardly | B．did I ; could hardly |
| C．was I; couldn’t hardly | D．I was; could hardly |
Gun control is a subject __________ Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
It is obvious to the students _________ they should get well prepared for their future.
| A．as | B．which | C．whether | D．that |
John may phone tonight. I don’t want to go out _______ he phones.
| A．as long as | B．in order that | C．in case | D．so that |
You are required to write _______ so that we can see it clearly.
| A．every the second line | B．every other lines |
| C．every a few lines | D．every other line |