In his victory speech ________before a huge crowd of his supporters，Obama declared that “change has come to America”．
| A．having delivered | B．to be delivered |
| C．delivering | D．delivered |
The witness who appeared in court ____ to speak out the truth instead of covering it up．
| A．encouraged | B．has been encouraging |
| C．was encouraging | D．had been encouraged |
Several years ago they found in England a tomb of a man ____ from around 2,300 B．C．
A．dated B．dating C．dates D．to date
—Why did you leave the water running in the sink?
—My goodness! I guess I ____ to turn off the tap．
| A．forgot | B．have forgotten | C．forget | D．had forgottten |
Washington, a state in the United States, was named _____ one of the greatest American presidents．
| A．in favor of | B．by means of ． | C．in honour of | D．in spite of |
____ you ask many different questions will you acquire all the information you need to know．
| A．If only | B．As far as | C．So long as | D．Only if |