-Did you come to the museum by bike yesterday?
-No. Two inches of snow fell during the night. As a result, several main roads___
| A．piled snow | B．had been closed | C．were blocked | D．covered with snow |
I woke up with_______headache, yet by___________ evening the pain had gone.
| A．the the | B．不填；the | C．a ； the | D．a；不填 |
When Peter __________ the car door, he found the key left in his car. So he had to call for help.
| A．opened | B．was opening | C．was to open | D．had opened |
He was charged with murder, but the court found him _______ and he was released.
| A．ignorant | B．attempted | C．potential | D．innocent |
____________, I still couldn’t figure out what the headmaster said at the conference.
| A．Though I didn’t listen attentively | B．Attentively as I listened |
| C．Attentively as did I listen | D．As long as I listened |
Environmentalists urged that more effective measures ___________by the government to reduce the pollution.
| A．were taken | B．would adopt | C．be adopted | D．should take |