English

The word "barbaric" means uncivilized, brutal, or primitive, which matches option B. The other options do not convey the same meaning.

A cantata is a vocal composition with instrumental accompaniment, typically involving a choir, making 'choral work' the closest synonym among the options. Symphony, concerto, and opera differ in form and scope from a cantata.

A plebiscite is a direct vote by the electorate on an important public question, making 'direct popular vote' the correct synonym. The other options do not relate to the meaning of plebiscite.

The word "bicker" means to argue or quarrel about petty matters, which is synonymous with "squabble." The other options do not convey the same meaning.

The word 'endow' means to provide or supply with a quality, ability, or asset. Among the options, 'provide' is the correct synonym, as it aligns directly with the meaning of 'endow.'

The phrase 'so that' correctly introduces a purpose clause indicating the reason for studying hard, making it the appropriate choice to complete the sentence meaningfully.

The word "aver" means to state or assert something confidently. Among the options, "declare" is the closest synonym, as it also means to state something clearly and firmly. The other options do not match the meaning of "aver."

The word "sordid" means dirty or morally degraded, so the synonym "dirty" is the correct choice among the options provided.

The word "impregnable" means unable to be captured or broken into, so "safe against attack" is the correct synonym. Other options do not match the meaning.

The word "behemoth" refers to something enormous in size or power, often described as a huge beast. Therefore, "huge beast" is the correct synonym among the options provided.