Only when he failed ______ the stress he was under.
| A．he realized | B．did he realize | C．realized he | D．he did realize |
Put yourself in situations where you will be forced to communicate in English, ____ you will see more progress over time．
| A．or | B．so | C．yet | D．and |
Thousands of people ____ the company stores to leave flowers, notes, even apples with
a bite in the past two weeks．
| A．had been attending | B．had attended |
| C．have been attending | D．attended |
Education is a lifelong process, ____ starting long before the start of schooling．
| A．which | B．that | C．it | D．one |
—Shall we go out for a walk?
—I'm afraid not．We can't go out ___ our work is being done．
| A．before | B．until | C．as | D．after |
___ we have overlooked, however, is that there is no one answer to this question．
| A．Which | B．That | C．Where | D．What |