—When did the computer crash?
—This morning，while I ________ the reading materials downloaded from some websites.(2012·福建)
A．have sorted B．was sorting
C．am sorting D．had sorted
After school we went to the readingroom to do some reading，only to be told that it ________.(2012·安徽)
A．was decorated B．had decorated
C．had been decorating D．was being decorated
—Joan，what ________ in your hand?
—Look！It's a birthday gift for my grandma.
A．had you held B．are you holding
C．do you hold D．will you hold
I'll go to the library as soon as I finish what I ________.
A．was doing B．am doing
C．have done D．had been doing
“The moment ________ soon”，he thought to himself，waiting nervously.(2012·湖南)
A．came B．has come
C．was coming D．is coming
—I'm not finished with my dinner yet.
—But our friends ________ for us.(2010·北京)
A．will wait B．wait
C．have waited D．are waiting
