Mr. Sawyer started his career at Stanford University, _____ he became Professor of Physics in 2002.
| A．which | B．where | C．when | D．that |
My brother is an actor. He _____in several films so far.
| A．appears | B．appeared | C．has appeared | D．is appearing |
Years ago we didn’t know this, but recent science ______that people who don’t sleep well soon get ill.
| A．showed | B．has shown | C．will show | D．is showing |
Father ____ for London on business upon my arrival, so I didn’t see him.
| A．has left | B．left | C．was leaving | D．had left |
They ______on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.
| A．had been working; are still working | B．had worked; were still working |
| C．have been working; have worked | D．have worked; are still working |
---- Olympic champion Luo Xuejuan was chosen as the first Chinese torchbearer carrying the torch in March 2008.
---- She _____ very happy.
---- Yes, she said, “ To be the first Chinese torchbearer is a great honor. ”
| A．must have been | B．need have been |
| C．might be | D．can be |