English

The correct preposition to use with 'fed up' in this context is 'with'. The phrase 'fed up with' means being annoyed or tired of something, making option A correct.

The word 'prognosis' means a forecast or prediction about the likely outcome of a situation, especially a medical condition. Therefore, 'Prediction' is the correct synonym.

The preposition 'under' is the most appropriate and commonly used term to describe something located directly below another object, such as a metro station under the airport. 'Beneath' and 'below' are less commonly used in this context, and 'none of the above' is incorrect.

The correct preposition to use with 'working hard' in relation to a subject or skill is 'at'. We say 'working hard at arithmetic' to indicate effort focused on that area.

The correct form to complete the sentence is the gerund 'sleeping' because the verb 'have trouble' is followed by a gerund to indicate difficulty in performing an action.

The correct preposition to use with 'indifferent' in this context is 'to'. The phrase 'indifferent to' means lacking concern or interest in something, which fits the sentence meaning.

The term 'Gerontocracy' specifically refers to a form of government ruled by old people or elders. The other options do not relate to governance by the elderly.

The correct preposition to use with 'inquired' when asking about someone's health is 'after'. 'Inquired after' is a common English phrase meaning to ask about someone's well-being.

A 'caucus' is a meeting or gathering of members of a political party or group to make decisions, which aligns closely with the meaning of 'congregation' as a gathering of people. The other options do not relate to this meaning.

A bibliophile is a person who loves or collects books, so the synonym 'lover of books' correctly defines the term.