随着年龄增长，保持活跃很重要。

It's important to ___keep ___active as you get older.

我祖父就他的年纪来说，活跃得令人惊讶。

My grandfather is surprisingly ___active for his age.

孩子们非常活跃，喜欢在户外玩耍。

The children are very ___active and love playing outside.