我看向她的房间，但她仍然熟睡着。

I looked into her room but she was still ___fast ___asleep.

凯伦的孙子走进房间，发现她在她最喜欢的椅子上熟睡。

Karen's grandson walks into the room to find her ___fast ___asleep on her favourite chair.

尽管外面有噪音，婴儿整夜都睡得很熟。

Despite the noise outside, the baby remained ___fast ___asleep throughout the night.