With Shanghai World Expo drawing near, volunteers are making use of every minute to ________ their foreign language because language volunteers must pass a written test.
—Good morning,Bill. —Did you have any trouble _____ through the snow?
We hoped _____ being there would make the work easier.
—What are you going to do this afternoon? —I'm thinking of _____ to visit my aunt.
The boy is only five years old,but he is quite used _____ the telephone.
They enjoyed _____ a wonderful evening at the Country Club.