The researcher _______carefully the differences between the two phenomena.
A. explore
B. exploring
C. explored
D. is explored
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Those involved in the accident have been _______ and found blameless.
A. investigate
B. investigating
C. investigates
D. investigated
My parents _______me not to go into the business world.
A. prefer
B. occupate
C. conduct
D. explore
His decision _______many years of investigation and research.
A. narrow down
B. is based on
C. investgate
D. is comprised of
The police have to _______ their list of suspects.
A. is comprised of
B. base on
C. narrow down
D. take into consideration
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