It's the sort of work that _________ a high level of concentration.
| A．calls for | B．makes up |
| C．lies in | D．falls for |
You can’t imagine what difficulty we had ____ home in the snowstorm.
| A．walked | B．walk | C．to walk | D．walking |
When asked why he went there, he said he was sent there ____ for a space flight.
| A．training | B．being trained | C．to have trained | D．to be trained |
______ their hats into the air, the fans of the winning team let out loud shouts of victory.
| A．To throw | B．Thrown | C．Throwing | D．Being thrown |
They desired that they _____ the right to vote.
| A．had | B．have | C．are | D．were |
As the boy listened attentively in class, everything his teacher said was easily______.
| A．for him to understand | B．understood | C．to understand | D．to be understood |