--- My son is _____ to be seen. Where has he gone?

--- I think he _____ in the building.

A. nowhere; must be hiding              B. nowhere; must be hidden himself

C. anywhere; hides                     D. everywhere; hides himself

 (2010年青岛市第二次模拟)—Where is your uncle’s home?

—In New York.But he________in Boston for four years.

A．has lived                       B．lived

C．had lived                      D．had been living

—This returned Chinese scholar has become one of the top experts in this field .

    —Yes , I know him very well . He  ____in Africa with wild animals for eight years .

   A．has worked         B．had worked       C．worked     D．has been working

It is strange that he _________ in such an important examination .

--- It’s already 9:00 o’clock, but he hasn’t turned up yet. 

--- He ______ in the traffic jam.