互联网是一种强大的全球交流工具。

The Internet is a powerful ___instrument of global communication.

新的监控系统被视为国家控制的工具。

The new surveillance system was seen as an ___instrument of state control.

法律应作为实现社会正义的工具，而非压迫的手段。

The law should serve as an ___instrument for social justice, not oppression.