21、Scientific/science/technology/technological

22、Understandable/understand/reasonable

23、Still exist/be still with us

24、Stop/halt/prevent/end

25、Misrepresented/paint unreal pictures

26、Grammatical rules/ rules of grammar

27、Reliable/predictable

28、Increase income/export earner

29、In the vicinity of/around/nearby

30、Result from/cause

31、Comparatively/relatively

32、Unnecessary/redundant/superfluous

33、Initially/originally

34、Be used to/by means of

35、Signal strength/ strength of the signal

36、Stock sth./ a stock of sth.

37、Be exposed to/ by exposure to

38、Be contingent on/ depend on

39、Reveal/present/presentation

40、Consumer/market force

41、Current trend/majority of the public

42、sceptic and advocate=different attitude

43、alter=change=revise=make changes

44、sceptic and advocate=different attitude

45、environment=condition=situation

46、trial=experiment=test

47、pick out=identify=recognize=know=tell

48、invention=device=creation=innovation

49、farming=agriculture

50、civil=municipal=metropolitan