题目内容：
短文改错。
Three young pioneers were playing while they saw a young tree bending to one side with some of it's leaves falling.
They felt sadness and decided to save it. They put
up a hard stick close by and tie the tree to
it to make it straightly. Then they make a fence
around it to prevent people and animals of
coming near. They also put up a board there, on that
they wrote:"Cherish young tree." After that, the
three often came to watering the tree. Gradually,
the young tree grew straight and strong. Their teacher learned
this and praised them, "Well do. Children." 1.________
2.________
3.________
4.________
5.________
6.________
7.________
8.________
9.________
10.________
参考答案：