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代入正确答案：
Responding to the public’s fascination with-and sometimes undue alarm over-possible threats from asteroids,
               astronomers have developed a scale to rate （how likely a particular asteroid or comet will be) to collide with Earth.                                                                                 主语             谓语     宾语    宾补                        宾补中的宾语（how到结束）是由how疑问词引导的名词性从句，其一般句式就是a partucular asteroid or comet will be likely to collide with Earth. 我不知道如何从语法上叙述清楚。但根本不是什么be to do表示将来. 举个例子： i just want to know how sure you are to win the game.

-- by 会员 well4eva (2008/3/23 23:25:00)

最优解释。likely 和likelihood看起来只是词性之差，用法实则微妙。