她放下电话，突然哭了起来。

She put the phone down and ___burst ___into tears.

聚集在舞台上的孩子们突然唱起歌来。

The children gathered on the stage suddenly ___burst ___into song.

金妮感到如此沮丧和失望，以至于她突然哭了起来。

Ginny felt so depressed and disappointed that she ___burst ___into tears.