I have a bad toothache, so I have to go to_____ as soon as possible.
A. dentist's
B. the dentist's
C. dentist
D. dentists
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To make matters worse, the_____of this infectious disease still remains unclear.
A. reference
B. request
C. resource
D. origin
A nuclear accident would have serious _____for the environment, so we should be careful.
A. effects
B. influences
C. consequences
D. endings
Sarah intends to take full______of this foreign trip to buy the things she wants.
A. interest
B. chance
C. charge
D. advantage
Their______is to defend their country against the enemies' attack.
A. duty
B. respect
C. glory
D. luck