根据短文内容，用括号内所给动词的适当形式填空，必要时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 good time.
A boy said to his friends, “I ____ (not skate) on a real lake so far. It's wonderful! Look! I can fly!” Suddenly the ice broke. One of the boys fell into the water. 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 was thin. The two Canadians fell into the water, too. But they tried their best
____(save) the little boy. They knew they ____ (be) quick, or the boy would be frozen.
Many guests from the hotel ____(run) over to help. The boy and the two Canadian women were out of water at last. One of the women didn't feel well. She ____(send) to hospital at once. She felt happy because the boy was safe.
