—Are you satisfied with her answer? —Not at all. It couldn’t have been ________.

It is known to us all E-mail is______ efficient than sending a fax. 

I think it ______ that she should be knowledgeable about computers for her present job.

—What do you think of the little blind singer?—I’ve never seen such a singer with________ sense of music.

—Does coffee really work when you have to work late into night?—Yes. As far as I’m concerned，I feel very________ after a coffee.