What shall human beings do if oil_______sometime in the future?
| A．will run out | B．runs out of | C．runs out | D．will be run out |
Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited．
| A．the; the | B．/; / | C．/; the | D．a; the |
We have every reason to believe that _______2010 World Expo in Shanghai will be _______ success.
| A．/ ; a | B．the; / |
| C．the ; a | D．a; a |
----Have you known Professor Jackson in our department for a long time ?
----Yes, since he _____ the our university.
| A．has come | B．comes | C．had come | D．came |
--- Something wrong with my headache .
--- No wonder. You ___________ on the program for such a long time.
| A．have worked | B．worked |
| C．have been working | D．were working |
_______ two exams to worry about, I have to work really hard this weekend.
| A．With | B．Besides |
| C．As for | D．Because of |