It wasn’t until he came back _____ he knew the police were looking for him.
| A．when | B．that | C．since | D．before |
Had you joined the caht room ten minutes ago, you would have known what we _______about then.
| A．had talked | B．have talked | C．talk | D．were talking |
It is too bad for someone in such a high _______ in the government to behave badly in public.
| A．position | B．situation | C．profession | D．condition |
—Why are your hands so dirty?
—I ____________in the garden.
| A．was working | B．have worked | C．worked | D．have been working |
If I can help ____, I don’t like working late into the night.
| A．so | B．that | C．it | D．them |
—Why not open the windows to let _____cool air in?
—I’d rather you didn’t. ________air in out town is terribly polluted.
| A．a; The | B．/; The | C．/ ;/ | D．the; / |