他在处理化学品时总是格外小心。

He always handles chemicals with great ___caution.

老师给了那个捣乱的学生两次警告。

The teacher gave two ___cautions to the misbehaving student.

在经济不稳定时期，我们应该在支出上保持谨慎。

During uncertain economic times, we should practice ___caution with our spending.