21． More than one high official_____by the police since the mayor war shot dead.
| A．has been questioned | B．have been questioned |
| C．was questioned | D．were questioned |
The soldier rushed into the cave, his right hand ____ a gun and his face ____ with snow.
| A．held; covered | B．holding ;covering |
| C．holding; covered | D．held; covering |
With no one looking after my son, I have no choice but ____ this chance to go abroad.
| A．giving up | B．give up |
| C．to give up | D．gave up |
The missing boy was last seen ____ in the park with other children.
| A．play | B．playing |
| C．played | D．to play |
_____ to the nearest hospital, the injured boy was treated without delay and has been out of danger.
| A．Rush | B．Rushing |
| C．To rush | D．Rushed |
It is demanded that the system of buying train ticket in real names _____ out during the Spring Festival.
| A．will be carried | B．be carried |
| C．to be carried | D．should carry |