阅读理解：
It’s Sunday. All the children of Class1 are going on a trip. The children are very excited. They will go to the zoo.
Mr. Black: Look! The elephants!
John: Wow! Look at the big one. It’s much bigger than others. Its legs are longer. And it’s stronger.
Wu Yifan: Yes. I think it’s older, too.
Amy: Look at the monkeys. They are fnnier.
Sarah: There is a little monkey. It’s so sad, isn’t it? Why?
Amy: Oh! Look at its tail. Its tail is shorter than the other monkeys.
Sarah: It is so poor.
（1）They go to the ________ on Sunday.
（2）The big elephant is much _______ than others.
（3）The monkeys are shorter but ________ than the elephants.
（4）The little monkey’s tail __________.
（5）The little monkey feels so ____________.