The active voice, which requires an agent (a “doer”), is preferred to the passive voice on the SAT exam. Also, the sentence presents a logical problem, as it does not clearly indicate whether the old oak tree discovered the bicycle or someone or something else did.

The initial sentence is in passive voice. The correct answer conveys the proper meaning while changing it to active voice.

The central problem with the underlined words in the sentence is that the animals seem to be the ones doing the domesticating—at least until the reader gets to the phrase "by human beings," and the sentence becomes confusing. The underlined words need to convey that human beings are the ones doing the domesticating, and that the animals are the objects of that domestication. Since "Very few animals in the world" is the subject of the sentence and cannot be changed here, we need to use the passive voice to describe that domestication is the thing being done to the animals. "To be domesticated" is the correct answer choice, as it is the only answer that correctly uses passive voice and avoids introducing additional errors (like "to be domesticating," which uses present progressive tense unnecessarily and doesn't agree with the previous past-tense verb "were . . . able."

The problem with the original sentence is that it is passive. It is often more direct and therefore better to use the subject who does the action as the subject of the sentence. The other answer choices that fix the passive problem either confuse the verb tense or the word order.

The initial sentence is wordy and in passive voice. The correct answer is concise and active.

士兵会麻烦“给予”一奖”by the President." The use of the final prepositional phrase "by the President" indicates that the soldier is receiving the award. The only answer choice that clarifies this point is "the soldier was given the country's highest honor," making it the correct answer choice.

Figure out who is the subject of the first part of the sentence—the class president, rather than the campaign itself, heard about the crisis. Also, avoid passive voice ("the campaign was organized").

Avoid the passive voice of the original ("the crumbled paperwasretrieved") and choose the simplest answer that preserves the original meaning of the text.

The context of the underlined phrase show it is actually a use of the passive voice, with the anticipation done "by the employees," not the new boss. Thus, the correct answer must feature a passive construction. "Was eagerly anticipated" is the best choice among the answers.

The sentence is written as to make the texts be "confused," when the latter part of the sentence makes clear the people reading them are "confused." The word needs to be changed to a form that properly conveys this. "Are often confusing" is the best choice among the answers.