---Ouch! You hurt me! ---I am sorry. But I______ any harm I ______ to drive a rat out. A didn’t mean; tried B. don’t mean; am trying C. haven’t meant; tried D. didn’t mean; was trying
—The authors of computer viruses are geniuses.
—I agree. If they applied their wisdom to other net technology _____ human beings can benefit, it would be better.