豚鼠毛色的遗传符合基因的自由组合定律，相关基因均位于常染色体上．毛色的产生机理为：白色前体物→棕色→黑色，其中A基因控制棕色，B基因控制黑色．另外基因d纯合会抑制色素的产生，但因其基因频率非常低，一般不予考虑．现有纯合的白色豚鼠和纯合的棕色豚鼠若干（未考虑d基因），请回答相关问题：

    The only survivor of a shipwreck(失事船)was washed up on a small, uninhabited island. He prayed worriedly for God to rescue(营救)him, and every day he scanned the horizon for help, but ____seemed forthcoming(即将来临的). Exhausted, he ____(eventual)managed to build a little hut(小屋)out of driftwood(漂浮的木头)to protect him____the bad weather, and to store his few possessions(财产). But then one day, after searching for food, he arrived home to find his little hut in flames, the smoke____(roll)up to the sky. The worst had happened;____was lost. He was almost fainted(昏倒)with grief and anger. “God, how could you do this on me!” he cried. Early the next day, however, he was awakened by the sound of a ship that ____(approach)the island. It had come to rescue him. “____did you know I was here?” he asked one of his rescuers. “We saw your smoke signal,” they replied.

    It is easy to get discouraged when things are going bad. But we____lose heart,____God is at work in our lives, even in the middle of pain and suffering.

    Remember, next time your little hut is burning to the ground it just may be ____smoke signal from the grace(恩泽)of God. For all the negative things we have to say to ourselves. God has a positive answer for them.