单项选择题
A．A friend from New York. B．A message from Tony. C．A postal delivery. D．A change in the weather.
A．They repaved it with rocks. B．They built public restrooms on it. C．They beautified it with plants. D．They set up cooking facilities near it.
A、allowing B、avoidable C、briefly D、component E、determined F、helping G、increasingly H、lowest I、maintain J、maximum K、prevent L、principle M、provoke N、seriously O、topic