________twice a year，whether it is a car or a bus or a truck，is the rule that every driver must obey in this city.
| A．Examining |
| B．Examined |
| C．Being examined |
| D．Having been examined |
They are shocked to find that in this town the traffic rules are not strictly ________.
| A．noticed | B．recommended | C．observed | D．concerned |
How can you expect him to make any progress ____ you never give him a chance to have a try?
| A．when | B．unless | C．even though | D．until |
---Is there any flight to New York?
--- I think there ______ be, for it is snowing so heavily.
| A．shouldn’t | B．mustn’t | C．can’t | D．needn’t |
---I have some good news for you. You’ve been accepted as a member of our club. ---_____________ That’s great!
| A．Good idea! | B．Pardon? | C．Congratulations! | D．Have I? |
Afer decades of effort, the city is still trying to_______ how to ban smoking in public places.
| A．look through | B．get through | C．figure out | D．take out |