while__(walk) along the street,I came across a couple

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• while__(walk) along the street,I came across a couple
• While waiting for the bus,I put my white stick into my bag.A little girl came up and asked me ,“ Would you please help me cross the street?I am afraid of cars.” “ Sure,”I said,“Let’s walk to where the white line are painted across the street.” The little girl said “ OK”.At the crossing,I said,“ now,look carefully.When you see no cars are coming,tell me.” In this way we crossed the street.Safely on the other side,The little girl thanked me and ran away
• while__(walk) along the street,I came across a couple
• 游记作文300字
• 1.试证明a(a+1)(a+2)(a+3)+1是完全平方式