Jim was late for two classes this morning. He said that he forgot both of the ______.
| A．rooms number | B．room number |
| C．room’s numbers | D．room numbers |
As a teacher, it is my _________ to make the students devoted to their study.
| A．responsibility | B．affection |
| C．performance | D．judgment |
The research lacksevidence，and therefore，its conclusions are doubtful.
| A．solid | B．fierce | C．severe | D．potential |
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 |
Though he is ill，he has not quit.
| A．smoke | B．to smoke | C．smoked | D．smoking |
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 |