Last summer I learnt to ride a bicycle. At first, I was 【S1】______ unable to control its direction. Sometimes I fall to

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问题 Last summer I learnt to ride a bicycle. At first, I was         【S1】______
unable to control its direction. Sometimes I fall to                【S2】_____
the right or to the left. I worried to ask my father                【S3】______
impatiently how I could ride straight, so he didn’t                 【S4】______
answer me directly. Instead, he took me to side of the              【S5】______
street. "Can you find any bike track is really straight?"           【S6】______
asked my father. I watched more carefully and shook my              【S7】______
head. "No," he said, "in fact, neither of the tracks is             【S8】______
always straight. But just by correct the direction                  【S9】______
every now and then, you had already gone forward."                  【S10】______

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