按汉语提示完成句子。

1. This book has a ______ (独特的) value.

2. I only wear a tie on special ______ (场合).

3. Congress has approved the new educational ______ (预算).

4. The children were taking turns on the ______ (滑梯) in the playground.

5. I often played hide-and-seek games with my little friends to ______ (使愉快) ourselves.