(2) For people who ride bicycle in cities, there are many rules they must abide by to ensure their safety.   16    , cyclists should always wear helmets. Second, since a bicycle is a moving vehicle, cyclists have to obey all traffic laws just as the drivers of moter scooters or cars do. Cyclists passing through intersections should use hand signals if making a turn and ring bells when necessary so motorists hear them traveling behind or around them.   17    possible, cyclists should also stick to bicycle lands. These are by far the safest lanes to ride in, as other vehicles are   18     from them. In the past, to avoid being hit by motor vehicles on the road, cyclists had to ride on sidewalks, but now many cities let cyclists   19     special lanes designated just for them. Bicycle lanes not only make cycling safer   20     create safer sidewalks for pedestrians. Overall, hitting the road on bikes can be a fun and healthy thing to do in a city, as long as cyclists follow the rules.
【題組】16.
(A) All over
(B) First of all
(C) Best of all
(D) After all