All flight___,we decided to take a train
| A．were canceled |
| B．had been canceled |
| C．having canceled |
| D．having been canceled |
Teenagers are warned to be careful when making friends online, because when you can’t see a person, they could be _______.
| A．everybody | B．somebody | C．anybody | D．nobody |
He hurried to the station only ____ that the train had left.
| A．to have found | B．finding | C．found | D．to find |
Lily’s mobile phone was left in a taxi accidentally, never______________ again.
| A．to find | B．to be found | C．finding | D．being found |
A new teachnique ____the yields as a whole increased by about 30 percent.
| A．had applied | B．having applied | C．to have applied | D．having been applied |
No matter how frequently _____ ，the works of Shakespeare always attract large audiences．
| A．performing | B．to be performed | C．performed | D．being performed |