English

A hypochondriac is a person who is excessively worried about having a serious illness, often thinking they are sick without medical evidence. The other options refer to different meanings: misogynist is a person who hates women, misanthrope is someone who dislikes humankind, and hyperpituitary relates to excessive pituitary gland activity.

A volunteer is someone who offers their service without expecting payment, which directly matches the question. The other options do not fit this definition: a philanderer is a person who engages in casual romantic affairs, a mercenary works for payment, and a missionary is someone sent on a religious mission, which may or may not be paid.

The word "earnest" means serious and sincere. Its antonym is "frivolous," which means not serious or lacking in importance. Therefore, option B is correct.

The word "indigenous" means originating or occurring naturally in a particular place, which is synonymous with "native." The other options do not share this meaning.

The word "culpable" means deserving blame or guilty of a fault. Among the options, "guilty" is the correct synonym, while the others do not share this meaning.

The word "ingenuous" means innocent, naive, or straightforward, so the synonym is "naive." The other options (sophisticated, clever, cunning) have different meanings that do not match "ingenuous."

Hypocrisy is the practice of pretending to have feelings, beliefs, or virtues that one does not actually possess, which directly matches the question's description.

The correct preposition to indicate a duration of time is 'for'. 'He was in UK for three weeks' correctly expresses the length of time he stayed. Other options do not fit grammatically or contextually.

The word 'expunge' means to erase or remove completely. Among the options, 'purge' and 'eradicate' both imply removal, but 'purge' is a closer synonym to 'expunge' as it specifically means to remove or cleanse completely, often of something unwanted. 'Eradicate' also means to remove completely but is more commonly used in contexts of eliminating something harmful or undesirable, often on a larger scale. 'Rationalize' and 'exhale' have different meanings unrelated to 'expunge'. Therefore, 'purge' is the best synonym here.

A 'homily' is a religious discourse or sermon, so the synonym is 'sermon'. The other options are unrelated to the meaning of 'homily'.