我需要改掉咬指甲这个坏习惯。

I need to stop biting my ___nails - it's a bad habit.

我在手提包里放了一个指甲锉以备不时之需。

I keep a ___nail file in my handbag for emergencies.

剪完头发后，她又去做了美甲。

After her haircut, she went to get her ___nails done.