Only when it is hungry______ a human being.
| A．a lion will attack | B．a lion would attack |
| C．will a lion attack | D．would a lion attack |
—Where are the children？The dinner's going to be completely ruined.
—I wish they ________ always late.(2011·北京)
| A．weren't | B．hadn't been |
| C．wouldn't be | D．wouldn't have been |
________ the problem, he wouldn't have committed those mistakes.
| A．If he understood | B．Had he understood |
| C．When he had understood | D．If he would understood |
________ I be free tomorrow, I would go with you.
| A．Could | B．Should | C．Might | D．Must |
If he ________ my advice, he wouldn't have lost his job.
| A．followed | B．should follow |
| C．had followed | D．would follow |
This printer is of good quality.If it ________ break down within the first year，we would repair it at our expense.
| A．would | B．should | C．could | D．might |