他喜欢在公园里独自散步。

He enjoys taking ___solitary walks in the park.

那是一次穿越印度的为期一个月的独自旅行。

It was a month-long ___solitary journey through India.

她更喜欢独自阅读，而不是小组讨论。

She prefers ___solitary reading over group discussions.