English

The word "spurious" means false or not genuine. Therefore, its antonym is "genuine," which means real or authentic, making option D the correct answer.

The adjective 'similar' is conventionally followed by the preposition 'to' in standard English usage. The phrase 'problems similar to yours' is the correct and idiomatic form. Using 'with' after 'similar' is not standard and sounds ungrammatical. Therefore, the correct preposition to complete the sentence 'I have had problems similar ____ ____ ____ ____ yours.' is 'to'.

The word 'matutinal' means 'pertaining to the morning.' Its antonym is 'crepuscular,' which refers to twilight or dusk, the opposite time of day. Therefore, option B is correct.

The word "brazen" means bold and without shame. Its antonym is "bashful," which means shy or easily embarrassed, making option A the correct opposite. The other options do not convey the opposite meaning of brazen.

The word "kowtow" means to act in an excessively subservient or deferential manner. Its antonym is "snub," which means to ignore or reject someone disdainfully, representing the opposite behavior.

The correct preposition to use in this comparative sentence is 'from'. The phrase 'different from' is the standard and grammatically correct form in English, making option C the correct choice.

The word "quiescent" means inactive or at rest, so its antonym is "active," which means engaged or in motion. The other options do not represent the opposite meaning.

The sentence 'Sana is washing her clothes' is in the present continuous tense. Its passive voice form is 'Her clothes are being washed by Sana,' which correctly uses the present continuous passive construction.

The sentence 'The boy has rung the bell' is in the present perfect tense active voice. Its correct passive voice form is 'The bell has been rung by the boy,' which maintains the present perfect tense and correctly uses the passive construction.

The correct preposition to use with 'astonished' when expressing surprise about something is 'at'. The phrase 'astonished at his failure' is grammatically correct and commonly used.