他在阳台上弹奏夏威夷小吉他，音乐轻快悦耳。

He played a happy melody on his ___ukulele on the balcony.

她在沙滩上用尤克里里弹奏了一首欢快的夏威夷民谣。

She played a cheerful Hawaiian folk song on her ___ukulele at the beach.