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.
