After Bret suffered severe brain damage in the early morning, he spent the entire weekend under close __________ in hospital.
A. examination
B. investigation
C. observation
D. consideration
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At the end of eight months, it was almost with reluctance that I left these friends and _________ insects.
A. turn to
B. turn up
C. turn out
D. turn on
Albert Einstein said, “Only two things are __________: the universe and human stupidity; and I’m not sure about the former.”
A. infinite
B. chronic
C. destructive
D. infectious
We need to ______ the forest.
A. serve
B. preserve
C. deserve
D. observe
We need to ________ the important points when taking down notes.
A. highlight
B. enhance
C. gain
D. boost