看到小狗滑稽的样子，他忍不住一直微笑。

He kept ___smiling at the puppy's funny antics.

看到孩子拿到奖状时，她露出了欣慰的笑容。

She couldn't help ___smiling when she saw her child receive the award.

阳光下的花朵似乎在开心地微笑。

The flowers in the sunlight seem to be ___smiling happily.