He is a doctor with ____.
A. patiently
B. impatient
C. patient
D. patience
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____, an accident happened to his brother.
A. Fortune
B. Fortunately
C. Unfortunately
D. Unfortunate
WTO stands for the World Trade ____.
A. organization
B. organize
C. organizer
D. organized
He is a good ____. He often practices playing the piano.
A. player
B. worker
C. piano
D. pianist
This place is very ____.
A. danger
B. dangerous
C. dangers
D. dangered