English

The word "successful" best fits the sentence because it directly relates to the operation achieving its intended positive outcome, which aligns with the patient surviving despite slim chances. "Effective" and "calculated" do not appropriately describe the outcome of the operation in this context.

The idiomatic and grammatically correct phrase is 'died away,' which means the sound gradually faded or disappeared. The phrase 'died with' is not used in this context. Therefore, the correct preposition to complete the sentence is 'away.'

The correct preposition to use with 'laugh' in this context is 'at' because we laugh at someone or something, not on, in, or with. Therefore, 'Never laugh at the old persons' is grammatically correct.

The word 'alleviate' means to make something less severe or to reduce it, so 'Reduce' is the correct synonym among the options provided.

The phrase 'Check the weather condition _____ travelling' is not idiomatic with any of the options 'Initial', 'Previous', or 'Earlier'. The correct and natural phrasing in English is 'Check the weather before travelling' or 'Check the weather forecast before travelling.' Therefore, among the given options, 'None of these' is the correct choice because none fit the blank appropriately.

The word 'Analyse' means to examine something methodically and in detail. Therefore, 'Examine' is the correct synonym among the options provided.

The sentence requires the simple present tense verb form to agree with the singular subject 'The philanthropic organization.' 'Distributes' is the correct form, while 'Distribute' is plural and incorrect here.

The word 'indubitably' means 'without a doubt' or 'undoubtedly.' Common synonyms include absolutely, certainly, definitely, indisputably, undeniably, undoubtedly, unquestionably, and without a doubt. The options given are 'doubtful,' 'controversial,' 'apparent,' and 'None of these.' None of the first three options are true synonyms of 'indubitably.' 'Apparent' means something that seems to be true or obvious but does not guarantee certainty, so it is not a synonym. Therefore, the correct answer is 'D' (None of these).

The word 'exonerate' means to free someone from blame or fault. Its antonym is 'charge,' which means to accuse or hold responsible. Therefore, 'charge' is the correct opposite of 'exonerate.'

The phrase 'The superior thought _____ the most suitable person to the job' requires the preposition 'of' after 'thought' to be grammatically correct, as in 'The superior thought of the most suitable person to the job.' Since 'of' is not among the options, none of the given options (A: On, B: At, C: Out) are correct. Therefore, the correct answer is 'D' (None of these). The explanation in the original question incorrectly states that 'on' is correct, but standard English usage confirms that 'thought of' is the proper phrase when considering or reflecting about someone or something.

The correct term is "Hors d'oeuvres," which refers to small savory dishes served before the main meal. The other options are incorrect or nonsensical in this context.

The word 'Rival' correctly fits the sentence as it refers to a competing business looking for an opportunity to destroy him. The other options do not make sense in this context.

The word 'solace' means comfort or consolation in a time of distress or sadness, making 'Comfort' the correct synonym.

The word 'promoted' correctly fits the sentence as it means being raised to a higher position or rank, which aligns with the context of outstanding performance. 'Raised' typically refers to increasing height or amount, 'progressed' is more general and less commonly used in this context, and 'None of these' is incorrect.

The word 'Outsider' (option C) best fits the sentence contextually and grammatically, as it refers to people who are not part of the local community and are often viewed with suspicion. 'Foreigner' (option B) specifically refers to someone from another country, which may not be the intended meaning. 'Stranger' (option A) is singular and does not agree with the plural verb 'are'.

The word 'massacre' means a brutal and indiscriminate killing of many people or animals, which is synonymous with 'slaughter'. The other options do not convey this meaning.

The correct preposition to use when referring to placing buttons on a dress is 'on'. 'On' indicates the surface where the buttons will be attached, making option A correct.

The word 'Analyse' means to examine something in detail, so 'Examine' is the correct synonym. The other options do not have the same meaning.

An accolade is a form of praise or an award given as a mark of approval or recognition. Therefore, both 'Approval' and 'Award' are correct synonyms, making option C the best choice.

The word 'solace' means comfort or consolation in a time of distress or sadness, making 'Comfort' the correct synonym.

Option A is the grammatically correct sentence. It uses the proper passive construction 'should be sent.' Option B is incorrect because 'send' should be in past participle form 'sent.' Option C is incomplete and ungrammatical. Option D is incorrect because option A is correct.

The antonym of 'drought' (a prolonged period of dryness) is 'surplus', which implies an excess or abundance, often of water or resources. The other options do not represent opposites of drought.

The word 'indubitably' means 'without a doubt' or 'undoubtedly.' None of the options A (apparent), B (controversial), or C (doubtful) are synonyms of 'indubitably.' Therefore, the correct answer is D ('None of these').

Flaming occurs when a person sends messages with angry or antagonistic content, often in emails or online forums. This matches option A, 'Flaming Email.' The other options do not relate to angry or hostile messages.

Phonetics is the branch of linguistics that studies the sounds of human speech, including their production, transmission, and perception. Therefore, 'Study of speech sounds' is the correct definition.