Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.

A. confirmed B. has confirmed

C. is confirmed D. has been confirmed

Though he is ill，he has not quit .

A．smoke B．to smoke C．smoked D．smoking

A good friend should be kind and helpful. _________ is my mother.

A. A such friend B. One such friend

C. Any such friend D. Such one friend

The research lacks evidence，and therefore，its conclusions are doubtful.

A．solid B．fierce C．severe D．potential

As a teacher, it is my _________ to make the students devoted to their study.

A. responsibility B. affection

C. performance D. judgment

The good thing about today’s children is that they can_____ very easily to new environments.

A. attain B. allocate C. adapt D. adopt

—You should take exercise in your spare time.

—I want to，but the little time I have outside of school is by part-time job.

A．taken away B．taken in

C．taken out D．taken up

The first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.

A. to have been held B. having held

C. held D. being held

______ the Internet is of great help, I don’t think it is a good idea to spend too much time on it.

A. Unless B. Since C. When D. While

_______the fierce competition in finding a good job in big cities, many fresh graduates are still trying their fortune in Beijing.

A. Apart from B. Regardless of

C. Instead of D. With regard to