Read the excerpt from the common sense of bicycling: bicycling for ladies.

there is a third movement of the handle-bars—a quick twist in the direction the machine is leaning if about to fall; it is made suddenly, and brings the wheel back to its original position. if the wheel were stationary, and the front wheel were turned, the bicycle would fall in an opposite direction from the front wheel. if the wheel is about to fall, it can be prevented from doing so by throwing the balance the other way by means of the handle-bars. a similar result is accomplished by wiggling the front wheel, and when a bicycle is moving very slowly, a continuous wiggle—changing the balance as the machine inclines from side to side—is necessary to keep it upright.

according to the excerpt, which steps are important to avoid falling off a bicycle?

releasing the handlebars and returning the wheel to its original position
using the handlebars to throw the balance and riding slowly
twisting the handlebars quickly and wiggling the front wheel
leaning in the opposite direction of the fall and keeping the wheel still

Read sentence 13 from the draft. some plants retain a great deal of their foliage through much of the spring and summer, but the leaves do not retain their green color for long. which detail would be best to add after sentence 13 to develop the topic? a. since the green color of the leaves that are bright and abundant during the warmer months will disappear by the time it is fall, it is important that the leaves are trimmed and kept freshly cut so that they will last for as long as possible. b. while the temperature outside may dictate when the fall colors of leaves appear, it is only one of many environmental factors that play a part in the changing of colors from green leaves to fall-colored leaves during the cooler months. c. if people want to enjoy the green color of leaves longer, trees should be planted where the environment is warmer and the days longer because chlorophyll in the leaves can only be manufactured and replaced with sunlight and warmth. d. the green chlorophyll normally masks the fall-colored pigments during the warmer months, but as sunlight becomes less abundant and trees become frozen, the fall colors of leaves become more visible as chlorophyll disappears.