我看了看他的房间，但他仍然完全睡着了。

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

洗了个放松的澡后，她几分钟内就完全睡着了。

After a relaxing bath, she was ___fast ___asleep within minutes.

孩子们太累了，在乘车途中就完全睡着了。

The children were so tired that they fell ___fast ___asleep during the car ride.