Choose the appropriate word which can be substituted for the given sentence: $A$ remedy for all diseases.

Choose the appropriate word which can be substituted for the given sentence: 'The part of government which is concerned with making of rules'.

Choose the appropriate word which can be substituted for the given sentence: An unexpected piece of good fortune or an unexpected gain.

Choose the appropriate word which can be substituted for the given sentence: 'Present opposing arguments or evidence'.

Choose the appropriate word which can be substituted for the given sentence: $A$ person who remains confident or hopeful about the success of something.

Choose the appropriate word which can be substituted for the given sentence: 'An arrangement of an event in order of occurrence'.