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The sentence discusses modern dancing and how it has become more scientific. The phrase "requires..." should logically be followed by something that reflects the skill or expertise needed for modern dancing. "Choreographic skill" refers to the ability to create and arrange dance movements which is more related to dancing than any other option.

The most appropriate option to fill the gap is B. would have stepped down. The sentence is in the modal form, which is used to talk about hypothetical situations in the past. The correct form is “If + past perfect, would + have + past participle”. In this case, the correct sentence would be “If he had considered his public image carefully, he would have stepped down from his office in the election”. The terms “step down” and “stand down” are interchangeable and can be used to indicate the act of resigning from a position or office. However, “step down” is more commonly used when discussing political positions or offices. In the sentence “Had he considered his public image carefully, he would have stepped down from his office in the election,” the phrase “would have stepped down” is used to indicate that the person would have resigned from their position if they had considered their public image more carefully.

The subject "government" is singular, so the verb should be "was" (singular form). The possessive pronoun "its" correctly refers back to the singular noun "government" and indicates ownership of the workers being recruited. Thus, the sentence should read: "The government which was recruiting its workers suddenly stopped doing so."

The sentence should read: Of course, we all saw the culprit approach and hit the man on the head. The verb to fill in the gap should model the verb "hit" in the other part of the compound structure.

A precocious child exhibits mature qualities, abilities or behaviour at an unusually early age. It describes children who show advanced skills or intelligence before their peers.

A prototype is an early model or sample of something, used to demonstrate the design or concept of a project. In the context of a proposed office complex, the director would likely show the contractor a prototype to illustrate the design or structure before construction begins.

The sentence should read: "Should you come early to the new house, clean up my flat." This is an example of a conditional sentence, where "should" is used to form a more formal or inverted condition (similar to "if you come early").

The sentence should read: "This imposing edifice cost a fortune to build." Cost is the correct past tense of "cost".

The sentence should read: "They let him go in respect to his age." Respect means consideration or honour due to a person's age. "in respect to" is the common expression.

The sentence should read: "Some scientists are trying to replicate human beings in their laboratories." Replicate means to make an exact copy or reproduce. It means that scientists trying to recreate or reproduce human beings.

The sentence should read: "He does not seem to know how to solve the problem, does he?" "Does he" forms the correct question tag for a negative statement ("He does not seem to..."), where we use a positive tag after a negative statement for contrast or confirmation.

The sentence should read: "These villagers used to grow rice." Used to shows an action or situation that was true in the past but is no longer the case. The villagers grew rice in the past but no longer do.

The sentence should read: "Ade tried to obliterate all memory of his dead father." Obliterate means to completely erase or destroy.

The sentence should read: "The weather is probably less appealing for people who live in Jos than for foreigners." Less ... than is the appropriate comparative structure to show that the weather may not be as appealing to locals as it is to foreigners.

The sentence should read: "The meeting was called to reconcile divergent views on the subject of a national conference." Reconcile means to bring together differing opinions or settle disagreements, which is appropriate here as the purpose of the meeting is to harmonise or address the different views on the topic.