tighten

系紧带子，这样它们就不会摩擦了。

___Tighten the straps so they don't rub.

他用螺丝刀拧紧螺丝。

He uses a screwdriver to ___tighten the screw.

学校决定加强考试纪律。

The school decided to ___tighten the exam rules.