31. The decision ______ Internet addiction(成瘾)as a mental disorder has caused much debate.
Faced with a bill for $ 10,000, ____________________.
With a large amount of work _________, the chief manager couldn’t spare time for a holiday.
Millions of people gave freely __________the starving people's appeal.
I don’t think your lecture ________ the audience, for they appeared quite puzzled.
—Do you think I should go to the seaside for a rest? —____________ .You have been busy for such a long time.