她突然哭了起来，跑出了房间。

She ___burst ___into ___tears and ran out of the room.

听到这个悲伤的消息，他突然哭了起来。

Hearing the sad news, he just ___burst ___into ___tears.

那个孩子找不到他的玩具，突然哭了起来。

The child ___burst ___into ___tears when he couldn't find his toy.