More studies will be required before we know what the functions of these genes are and whether they _______ to each other.
A. attach
B. relate
C. link
D. match
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The Department _______ many close contacts with the chemical industry.
A. prolongs
B. maintains
C. preserves
D. extends
My advice is to show you are serious and _______ about your subject.
A. thoughtful
B. pensive
C. attentive
D. considering
Every human being has a(n) _______ fingerprint that does not change over time.
A. special
B. distinctive
C. unique
D. only
Naomi was _______ her engagement ring.
A. showing off
B. showing up
C. showing down
D. showing through
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