书籍被随机地摆放在书架上。

The books were ___randomly arranged on the shelves.

它基于对语言学院学生的调查，这些学生是随机选择的。

It is based on the survey of the Language Institute's students, who were ___randomly selected.

获胜者是从所有参赛作品中随机选出的。

The winners were chosen ___randomly from all entries.