Our manager has gone to Paris, so I have to deal with all the letters during his ________.
#6244
A
appearance
B
distance
C
absence
D
presence
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 They were trying to remove harmful ______ from cigarettes.
#6937
A
content
B
substances
C
materials
D
mixtures
Since we have made ____, we have to make ____ to achieve more.
#5947
A
a progress; efforts
B
progresses; an effort
C
much progress; effort
D
little progress; efforts