许多学生考试不及格，仅仅是因为他们没有复习材料。

Many students fail the test ___simply because they don't review the material.

他喜欢徒步旅行，仅仅是因为这能让他与自然连接。

He enjoys hiking ___simply because it connects him with nature.

这个计划失败了，仅仅是因为缺乏沟通。

The plan failed ___simply due to a lack of communication.