It was reported that two famous _______would attend that conference.
A. woman scientist
B. women scientist
C. woman scientists
D. women scientists
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We must keep______with the rapid development of the world economy.
A. move
B. step
C. speed
D. pace
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
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