这是一个充满欢笑的节日。

It's a ___joyful festival.

孩子们在公园玩耍时充满了欢乐。

The children were ___joyful while playing in the park.

孩子们听到放假的消息时，脸上露出了欢快的笑容。

The children's faces lit up with ___joyful smiles when they heard the news about the holiday.