他们看起来很开心。

They look very ___cheerful.

她总是用欢快的声音打招呼，让整个办公室都充满活力。

Her ___cheerful greetings always brighten up the whole office.

阳光透过窗户照进来，让整个房间显得明亮欢快。

The sunlight streaming through the windows made the whole room look ___cheerful.