Hiking by oneself can be fun and good for health .It may also be good for _______building .
It seemed that the sea lion didn’t mind _______ with the tourists at all.
I have _______ some money for special use.
The world will be different, and we will have to be prepared to ________ the change.
He hurried to the station only _______ that the train had left.
The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.