'Each' is singular so requires singular possessive. Sons are male → 'his'.

Subject-Verb Agreement means the verb agrees with subject in number and person.

'One of the' takes a plural noun → should be 'recommendations'.

The + nationality adjective = the people of that country. 'The French' = the French people.

A person compulsively dependent on a harmful substance is 'addicted to' it.

'Officialese' is the formal complex language used in official documents and offices.

'Succumb' means to yield or fail to resist — closest synonym is 'submit'.

'Look forward to' — 'to' is a preposition requiring gerund. 'To receiving' is correct.

A 'digression' is a temporary departure from the main subject.

'Take into account' means to consider or include a fact when making a decision.

'To take someone to task' = কাউকে কঠোরভাবে তিরস্কার করা।

'Empirically' means based on observation and experience not theory.

'Put up with' means to tolerate or endure something unpleasant.

Parallel structure: gerund 'riding a bicycle' should be compared with gerund 'driving a car'.

'Extempore' means spoken without preparation. 'Impromptu' has the same meaning.

'Menacing' means threatening or suggesting danger. 'Alarming' is the closest synonym.

'Oblige' means to do a service or favor. Antonym 'bother' means to inconvenience.

A 'cynical' person is distrustful. A 'gullible' person is easily persuaded — the opposite.

'No more... than' indicates equality. We were equally surprised as Rahman.

'Not once' = 'never'. The neighbour has never invited them.