The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.
#5499
A
concerns
B
assumption
C
occupations
D
ignorance
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Opinions of that kind are best kept to yourself, and not voice_____.
#7202
A
by public
B
in public
C
in a public
D
in the public
He is not a(n)________, only  a(n) ___________.
#6621
A
friend; acquaintances
B
acquaintance; friend
C
friend; acquaintance
D
acquaintances; friend