The challenge was so i______ that he was suffering from insomnia during that period.

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The challenge was so i______ that he was suffering from insomnia during that period.

immense
immense challenge 巨大的挑战,
这个挑战太大了,所以那段时间我常常失眠.

important
挑战如此重要,那段时间他常失眠

indistinct渺茫的
机会如此渺茫,以至于他在那段时间里饱受失眠的摧残