Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
| A．during which time | B．for which time | C．during whose time | D．by that time |
With so many noises from the busy traffic in the street, I couldn’t______ and do my research work.
| A．put down | B．set down |
| C．cut down | D．settle down |
You _______ here last week if you were really worried about your work.
| A．ought to come | B．ought to be coming |
| C．ought to have come | D．ought have come |
The wooden house______ by many trees_______ south.
| A．surrounded; facing | B．surrounded; faces |
| C．surrounding; facing | D．surrounding; faces |
The boy was seen _______ in the examination and was punished by the teacher.
| A．cheating | B．cheat | C．cheated | D．having cheated |
If you_______ smoke, please go outside.
| A．can | B．should | C．must | D．may |