. Now everyone is concerned about how to conquer the economic crisis _______ is very important for us to be able to preserve our standard of living.
| A．which success | B．its success | C．the success of which | D．the success of it |
—Good morning，Bill． —Did you have any trouble _____ through the snow？
| A．driving | B．to drive | C．drive | D．drove |
We hoped _____ being there would make the work easier．
| A．he | B．they | C．his | D．himself |
—What are you going to do this afternoon？ —I'm thinking of _____ to visit my aunt．
| A．go | B．going | C．to go | D．to going |
The boy is only five years old，but he is quite used _____ the telephone．
| A．to answer | B．to answering | C．of answering | D．by answering |
They enjoyed _____ a wonderful evening at the Country Club．
| A．spent | B．to spend | C．spending | D．spend |