Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

The United States is one of just a few countries in the world which continues to use the British system of measurement.

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

Because the giant squid is an elusive creature rarely seen by humans, scientists are beginning to gain a better understanding of the creature by studying it using remote cameras.

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

Teaching is a profession which can present many unforeseen challenges.

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English. One of the answer choices reproduces the underlined portion as it is written in the sentence.

Prisons are a relatively recent phenomenon in world history, because exorbitant costs.

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

Some prescription drugs can produce dangerous interactions when combined with other chemicals, and you should always tell your physician about any medications you take at home.