—When did Bob leave?
—I have no idea. I ________ a shower upstairs.
A．took B．have taken
C．was taking D．would take
She is a hardworking student, and all her spare time she has ________ staying in the library.
A．spent B．is spent
C．to spend D．to be spent
—Do you know the Water Cube at all?
—No, this is the first time I ________ here.
A．have been B．came
C．was D．am going
A kind of newlymade shoes, if put into the market, ________ large orders because the heels can switch from 9 to 4 centimeters.
A．meets B．will meet
C．has met D．met
I had meant to meet you at the airport this morning but I was too busy for I ________ a report.
A．wrote B．was writing
C．have written D．had written
All the preparations for the task ________， and we're ready to start.
A．completed B．have completed
C．will be completed D．have been completed
