If you haven't exercised _____38_____, see your doctor first to make sure it's OK for you to increase your level of physical activity. Then start _____39_____ with 5 to 10 minutes a day. Add a little more time each week, aiming for 150 to 200 minutes per week. Try walking _____40_____, hiking, climbing stairs, swimming or taking a water-aerobics class, dancing, riding a bicycle outdoors or a stationary bicycle indoors, or taking an aerobics class.
【題組】38. (A). suddenly (B). briskly (C). lately (D). slowly