公园里的空气格外清新，让人精神焕发。

The air in the park was ___brisker, giving everyone a refreshing feeling.

晨跑后，他的步伐变得更加轻快有活力。

After the morning jog, his steps became ___brisker and more energetic.

他的回答变得简洁直接，不再浪费时间闲聊。

His replies became ___brisker as he stopped wasting time on small talk.