One evening when it was so warm, I stayed awake _________ until half past eleven in order to have a good look at the moon by myself. 
#65108
A
on average
B
on purpose
C
on sale
D
on schedule
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Over the past decades , sea ice          in the Arctic as a result of global warming .
#84442
A
had decreased
B
decreased
C
has been decreasing
D
is decreasing .
28. I'm afraid we'll have to work extra hours for there are still some problems ________.
#81046
A
remaining to settle
B
remaining to be settled
C
remained to be settled
D
to remain to settle