Had the government limited the sales of cars much earlier, traffic jam and pollution _______so serious now．
| A．has not been | B．would not be |
| C．had not been | D．wouldn't have been |
The moment she came back from work，she________ to clean the kitchen thoroughly.
| A．set out | B．set about | C．set off | D．set up |
I wanted to have a word with her，but she________ me and went away.
| A．saw | B．calmed | C．told | D．ignored |
The police chief advised his men to keep________ and not lose their tempers.
| A．calm | B．quiet | C．still | D．silent |
The headmaster has retired but no one knows who will________him in the post.
| A．follow | B．succeed | C．remove | D．achieve |
______ everyone here, I wish you a pleasant journey back to your country.
| A．By means of | B．On behalf of | C．In search of | D．For fear of |