<li><p>Xavier, never [one] [to remain] sedentary, preferred [riding] his bicycle to driving a car, as the exercise [made] him feel energized. [No error]</p></li>
<li><p>[The heart, located in the chest cavity just behind the breastbone and between the lungs, it is suurounded by a fluid-filled sac called the pericardium]. </p></li>
</ol>
<p>(A) as is
(B) The heart, located in the chest cavity just behind the breastbone and between the lungs, is surrounded by a fluid-filled sac called the pericardium.
(C) A fluid-filled sac called the pericardium surrounds the heart, which is located in the chest cavity just behind the breastbone and between the lungs.
(D) A fluid-filled sac called the pericardium, surrounding the heart, is located in the chest cavity just behind the breastbone and between the lungs.
(E) The heart, located in the chest cavity just behind the breastbone, and between the lungs, surrounds a fluid-filled sac called the pericardium. </p>
<p>(Source: PR diagnostic test 2759)</p>