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____ quite recently, most mothers in Britain did not take paid work outside the home. A) Before B) Until C) From D) Since23. The survival of civilization as we know it is ____ threat. A) within B) under C) towards D) upon 24. Scientists say it may be five or ten years ____ it is possible to test this medicine on human patients. A) since B) before C) after D) when 25. In some countries, is called equality does not really mean equal rights for all people. A) which B) what C) that D) one 26. I walked too much yesterday and ____ are still aching now. A) my leg39。s muscles C) my leg muscles B) my muscles of leg D) my muscles of the leg27. Radio, television and press ____ of conveying news and information.A) are the most three mon meansB) are the most mon three meansC) are the three most mon means D) are three the most mon means 28. Liquids are like solids ____ they have a definite volume. A) in that B) for that C) with that D) at that 29. When a fire ____ at the National Exhibition in London, at least ten priceless paintings were pletely destroyed. A) broke off B) broke out C) broke down D) broke up 30. The destruction of these treasures was a loss for mankind that no amount of money could ____. A) stand up to B) make up for C) e up with D) put up with 31. Then the speaker ____ the various factors leading to the present economic crisis. A) went after B) went for C) went into D) went on 32. The student was just about to ____ the question, when suddenly he found the answer. A) arrive at B) submit to C) work out D) give up33. When there are small children around, it is necessary to put bottles of pills out of ____. A) reach B) hand C) hold D