________ we stood at the top of the building, we were able to see the town below clearly.
| A．As |
| B．Although |
| C．Unless |
| D．Until |
．My headache _____ me．I thought it was going away, but it's getting worse and worse．
| A．killed | B．kills | C．is killing | D．was killing |
．What I need is ___ __ book that contains _____ ABC of English grammar．
| A．a; the | B．the; 不填 | C．the; an | D．a; 不填 |
—Did he come back late last night?
—No．It was not yet eight o'clock _____ he arrived home．
| A．before | B．that | C．until | D．when |
Students are now preparing for the college entrance exam．and I hope their efforts will _____．
| A．come on | B．go up | C．stand out | D．pay off |
—You just think of yourself! You kept me wailing for at least three hours．
—I’ m sorry that you _____ think so．
| A．would | B．should | C．could | D．might |