His health is ______improving. I'm sure he will come back to work soon.
#22588
A
gradually
B
frequently
C
fluently
D
finally
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The secret of his success is that he does everything___________.
#24410
A
efficiently
B
curiously
C
anxiously
D
slightly
All passengers _______, please fasten your seat belts and remain seated _______ the plane is landing.
#22186
A
on board; until
B
abroad; since
C
on the board; before
D
aboard; when