填空题 Last summer I learnt ride a bicycle. At first, I was 75. ______
unable to control its direction. Sometimes I fall to 76. ______
the right or to the left. I worried to ask his father 77. ______
impatiently how I could fide straight, so he didn't78. ______
answer me directly. Instead, he takes me to side of the79. ______
street. "Can you find any bike track is really straight?"80. ______
asked my father. I watched more careful and shook my 81. ______
head. "No," he said, "in fact, neither of the tracks is 82. ______
always straight. But just by correct the direction 83. ______
every now and then, you had already gone forward." 84. ______