A lucky person won the ______________.
A. content
B. concept
C. context
D. contest
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We usually take a __________ once a year.
A. vacation
B. vocation
This is one of the most important _______ in the history of mankind.
A. accidents
B. incidents
C. events
D. things
They are happy to give their services free of _____________.
A. price
B. cost
C. expense
D. charge
The fireman received a ________ for saving the child's life.
A. reward
B. prize
C. award
D. money