Answer:
They get comfortable with how they do things and lose the urge to push themselves outside of their comfort zones. On the other hand, other teachers never stop pushing themselves to learn new things.
The correct answer is letter (B)The <span>laburnum’s</span> (trembling) branches can hardly bear the burden of the beauty of “the honey-sweet and honey-colored blossoms of a laburnum” (6–7), the subject to which <span>“theirs” refers.</span>
