第四题是错的。应该是fell asleep 。类似的例句还有，Fortunately,I can always fall asleep as soon as I go to bed.幸运的是，我一上床，就能睡着。
1 go to bed
2 go to bed
3 went to sleep
4 went to sleep
5 falls asleep
go to bed
go to sleep
fall asleep
go to sleep
fall asleep
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