观众们热烈鼓掌，歌手不得不返场加演了一首歌。

The audience clapped so enthusiastically that the singer had to perform an ___encore.

观众们热情地要求返场，直到乐队又演奏了一首歌。

The crowd kept calling for ___encores until the band played one more song.

演唱会结束后，观众们热烈鼓掌要求加演。

After the concert, the audience cheered loudly for an ___encore.