题目内容：

阅读下面的短文，根据短文内容及首字母提示，在短文空白处填上一个适当的词，使短文完整、通顺，语法正确。

Last week, my lovely pet dog died. I was u1. these days.

This morning when the break time between classes came, all my classmates were having a rest. Some of them were playing games on the playground, and others were t2. with each other happily. I sat in my desk without a word. Then I saw Jack walk to me. He seemed to look for something on the floor by my feet. I asked him whether he lost something.“I lost a very important thing.” he said, “Now I’m looking for it on your face.” Suddenly I u3. what he meant. Then there was a s4. on my face, and it became bigger. Jack told me that was just the thing he was looking for.

It's a day's time whether you are happy or not, why not be happy to s5. every day?