题目内容
阅读下面短文，根据短文内容完成句子。
Once upon a time ， a hippo (河马）lived in a river next to a big tree. One day, a bird came and nested (筑巢）in the tree. The songs of the bird filled the hippo with so much envy (羡慕） that he couldn't think of anything else. Every day he would think why he wasn't born to be a bird even though the bird told him many times he was so lucky to be so big and such a good swimmer.
Finally, the hippo made up his mind that he would come out of the river, climb the tree and start singing. However, when he tried to climb the tree, it was very clear that the hippo didn’t have wings ， nor claws (爪子）to climb with.
Realizing that he would never climb up the tree, he angrily hit the tree until it came crashing (坠落）to the ground. Then he stepped onto the leaves of the fallen tree,and began singing.
Unfortunately (不幸地)，all that came from his mouth were terrible noises and when the other animals heard this, they all came around to make fun of the hippo.
He was so ashamed by this. He also felt bad about having knocked the tree over. He used all his strength (力气）to raise the tree back up again ， and looked after it until it completely recovered (康复).
1.The hippo envied the bird because the bird __________.
2.The hippo tried to climb the tree, but finally he __________.
3.Then he was so angry that __________ and began singing on the leaves of the fallen tree.
4.Unfortunately, the sound he made was so __________ that the other animals all laughed at him.
5.At last he felt __________ about what he had done.
