用括号内所给动词的适当形式填空，可加助动词或情态动词。

    It was getting dark. Some children and two Canadian women were still skating near a big hotel. They ____ (have) a great time.

    “A boy said to his friends,”I ____ (not skate) on a real lake so far. It's wonderful! Look! I ____ (fly)!" Suddenly the ice broke. One of the boys fell into the river. The children shouted, "Help! Help!" They didn't know what they  ____ (do). The two Canadian friends heard them and skated over to help the boy.

    The ice were not thin enough. The two Canadians fell into the river too. But they tried their best ____ (save) the little boy. They knew they were quick, or the boy would be frozen.

    Many guests from the hotel came over and ____ (run) to help. The boy and the two Canadian women were out of water at last. One of the women ____ (not feel) well. She ____ (send) to hospital at once. She felt happy because the boy was safe.

Kevin and John ____ ____ to go there yesterday.

***曾对一位外国来访的同志说：“1927年，老蒋够厉害啦！他把我们像鸡蛋一样地摔在地上，可他没想到，当时国外的许多智者也没有想到，我们还会孵出小鸡来！”对“孵出小鸡来”最准确的理解是（      ）