如图，在平面内有A、B、C三点．

（1）画直线AC，线段BC，射线AB；

（2）在线段BC上任取一点D（不同于B、C），连接线段AD；

（3）数数看，此时图中线段共有               条．

①海马②河蟹③沼虾④海豚⑤企鹅⑥水蛭

用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。

      My grandfather is seventy years old, ____  he is still very healthy. He is tall and of medium ____ . He has short straight white ____ He likes reading. Every morning he ____  up very early and then reads morning ____ . When he reads, he always wears ____ . He also likes ____  chess, too. He always plays chess with his ____  friends. He ____  plays chess with me. Why? Because I ____ play chess.