根据句子的意思，补全单词。

1. I was unhappy yesterday because my new glasses ___    _ on the ground and broke into pieces.

2. After the students finished the __      _ exam yesterday, they had the winter vacation.

3. Look! There is              a pink wallet on the ground. We must pick it up and find its            .

4. Don't be____     about your son.  He is not a child any more.

5. You must remember your ___    _ with your teacher next Sunday.