我朝他的房间看了一眼，但他还在熟睡中。

I looked into his room but he was still ___fast ___asleep.

然后她洗了个放松的澡，20分钟后她就睡熟了。

Then she took a relaxing bath and 20 minutes later she was ___fast ___asleep.

长途徒步后，孩子们几分钟内就睡熟了。

After the long hike, the children were ___fast ___asleep within minutes.