单选题 Mummy asks a little horse to carry a bag of wheat home.
On the way home, the little horse meets a small fiver. He is vey worried. "What should I do?" he thinks. At this time, he meets a squirrel.
"Can I cross the river?" the little horse asks.
"Oh, you can't. The river is very deep. You will drown," the squirrel says.
The little horse is very afraid. He cries.
A cow comes to the little horse. "What's the matter with you, little horse?" The cow asks. "I can't cross this fiver. It's very deep," the little horse answers. "Oh, don't worry. This river isn't deep at all. I am sure you can cross the river easily. Try!" the cow says.
The little horse stops crying. He tries his best and crosses the river.
The moral: You never know what you can do until you try.

单选题 One day, the little horse's mummy asks him to ______.

单选题 The squirrel thinks the little horse ______.

单选题 The cow thinks the little horse ______.

单选题 At last, the little horse knows ______.