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 |
Not for a moment ______ sightseeing while in Europe.
| A．has he stopped | B．he stops | C．did he stop | D．he did stop |
He ______be lazy, but he can work hard when he feels like it．
| A．may | B．will | C．should | D．must |
It was early morning in London _____ Prime Minister Cameron arrived to give his speech.
| A．where | B．when | C．while | D．that |
Many people are taking part in various outdoor activities ______themselves.
| A．refreshed | B．to refresh | C．being refreshed | D．having been refreshed |
At the end of the race his legs ____ and he fell down on the ground.
| A．gave out | B．gave off | C．worn out | D．used up |