_________ it takes many years to gain the skills of an expert.
| A．It is well known to us that | B．As is known to us that |
| C．As we know that | D．That is well known to us |
It was getting dark; I found a car _____ in a pool by the side of the road.
| A．to be stuck | B．stuck | C．sticking | D．stick |
In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
| A．it marked | B．marking | C．marked | D．to mark |
The old farmer, _____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.
| A．supporting | B．having supported |
| C．being supported by | D．being supported |
To answer correctly is more important than _____.
| A．that you finish quickly | B．finishing quickly |
| C．to finish quickly | D．finish quickly |
And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.
| A．having lost | B．losing | C．to be lost | D．lost |