I failed in the final examination last term and only then __________ the importance of study.
| A．I realized | B．I had realized |
| C．had I realized | D．did I realize |
They keys were __________ to our neighbours during our absence.
| A．given out | B．given away | C．given over | D．given up |
–Are you a teacher?
--No, but I ________.
| A．used to | B．was used to | C．used to be | D．used to do |
–You speak very good Chinese.
--Thanks. I _______ it for 4 years before I came to China.
| A．studied | B．study | C．was studying | D．had studied |
The Education Bureau gave a warning to each school without any _____ when the virus of H1N1 hit our city.
| A．delay | B．effort | C．schedule | D．consideration |
Expect everything to go wrong in advance, ___ you may feel quite so bad when it does.
| A．as if | B．and | C．or | D．so that |