In the past few years, sea ice ____ in the Arctic as a result of global warming.
| A．had melted | B．has been melting | C．melted | D．is melting |
Hearing the dog barking fiercely, away __________.
| A．running the thief | B．was running the thief |
| C．the thief was running | D．ran the thief |
This basketball team had lots of excellent players, so its fans had never expected that it ________ have failed in the final.
| A．would | B．might |
| C．should | D．could |
Failure hurts grownups and children, but it can make a ________ contribution to your life once you learn to use it.
| A．positive | B．thorough |
| C．enjoyable | D．chief |
Then professor walked onto the platform and seated himself in a chair, ________ for answering questions.
| A．had prepared | B．being prepared |
| C．preparing | D．prepared |
The headmaster has promised us that we shall be told ________ the results of the exam come out.
| A．in case | B．every time |
| C．ever since | D．the instant |