早晨的空气很凉爽，散步很舒服。

The morning air is ___cool, perfect for a walk.

尽管考试时间紧迫，他依然保持冷静，专注解题。

Despite the tight exam schedule, he stayed ___cool and focused on solving problems.

她的新发型看起来特别酷。

Her new haircut looks really ___cool.

把茶放在窗边让它凉一会儿。

Leave the tea by the window to let it ___cool for a while.