What _____ time it is to listen to a speech having nothing to do with you!
| A．waste | B．wastes | C．a waste of | D．a waste for |
. _____ the book four times, I finally understood the author's theory.
| A．Reading | B．Having read | C．To read | D．Read |
Mike seldom asks ____ questions in class, but today he raised _____ fairly good one.
| A．/; a | B．the; a | C．/; the | D．/; / |
_____ the news, so far, has been good, there may be days ahead when it is bad.
| A．While | B．When | C．As | D．Since |
. Although ________ after the Civil War, the American blacks still took no important role in the white Americans except as servants and laborers.
| A．no longer being slaves | B．were no longer slaves |
| C．no longer slaves | D．no longer been slaves |
The European market has long been favoring a number of African and Caribbean countries, ________ former colonies of Britain or France.
| A．many of whom | B．many of them | C．many of which | D．and many of them |