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41.Acute hearing helps most animals sense the approach of thunderstorms long before people（ ）.
42.This is an illness that can result in total blindness（ ）left untreated.
43.The central provinces have floods in some years, and（ ）.
44.Do help yourself to some fruit,（ ）you?
45.There（ ）nothing more for discussion, the meeting came to an end half an hour earlier.
46.My mother can’t get（ ）because she has rheumatism.
47.I was very much put（ ）by Mark’s rude behavior; it really annoyed me.
48.You（ ）Jim anything about it. It was none of his business.
49.All of us would have enjoyed the party much more if there（ ）quite such a crowd of people there.
50.Firms that use computers have found that the number of staff（ ）is needed for quality control can be substantially reduced.
