— Did you happen to see _______ black and _______ white cat?
— Are they missing? I told you to take care of them.
| A．a; 不填 | B．the; 不填 |
| C．the; the | D．a; the |
As he reached ______ front door, Jack saw ______ strange sight.
| A．the, / | B．a, the | C．/, a | D．the, a |
Much of the power of the trade unions has been lost.______, their political influence should very great..
| A．As a result | B．As usual | C．Even so | D．So far |
Stephen tried to get his wok______ in the medical circle.
| A．to recognize | B．recognizing | C．recognize | D．recognized |
Sam_______ some knowledge of the computer just by watching others working on it..
| A．brought up | B．looked up | C．picked up | D．set up |
As you _________ the tasks, cross them off your list so you may feel less pressure..
| A．obtain | B．gain | C．succeed | D．accomplish |