Humans are forever forgetting that they cant control nature. Exactly twenty years ago, th

Humans are forever forgetting that they cant control nature. Exactly twenty years ago, the Time magazine cover story announced【M1】______ that "scientists are on the verge of being able to predict the time, place and even the size of earthquakes". The people of quake-ruined Kobe (神户)learned last week how wrong that assertion was. All of the【M2】______ methods raised two decades ago have succeeded. Even now, scientists have yet to discover a uniform. warning signal that precedes all quakes, let alone any sign would tell whether the coming quake is mild or a【M3】______ killer. Earthquake formation can be triggered by many factors, says Hiroo Kanamori, a seismologist at the California Institute of Technology. So, finding one all-purpose warning sign is impossible. One reason: Quakes start deeply in the earth, so scientists cant study【M4】______ them directly. If a quake precursor were found, it would still be impossible to warn humans at advance of all dangerous quakes.【M5】______ Places like Japan and California are full with hundreds, if not【M6】______ thousands, of minor faults(断层). It is impossible to place monitoring instruments on all of them And these inconspicuous sites can be just as deadly their better-known cousins like the San Andreas.【M7】______ Both the Kobe and the 1994 Northridge quakes occurred in small【M8】______ faults. Prediction would be less important if scientist could easily build structures to withstand tremors. While seismic engineering has been【M9】______ improved dramatically in the passed 10 to 15 years, every new quake【M10】______ reveals unexpected weaknesses in "quake-resistant" structures, says Terry Tullis, a geophysicist at Brown University.

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