Choose the appropriate word which can be substituted for the given sentence: 'When someone is not able to sleep'.

Choose the appropriate word which can be substituted for the given sentence: '$A$ set of rules or code of diplomatic etiquette and precedence'.

Choose the appropriate word which can be substituted for the given sentence: $A$ person who talks about or supports the welfare of women or feminism.

Choose the appropriate word which can be substituted for the given sentence: 'Extreme old age when a man behaves like a fool'.

Choose the appropriate word which can be substituted for the given sentence: 'Be the embodiment or perfect example of'.

Choose the appropriate word which can be substituted for the given sentence: 'Something which is used as a sample'.