Yesterday _______ Saturday. I didn’t _______ to school. I went the library _______ my father. _______ breakfast, we went there by bike. I _______ an interesting book. There were many signs _______ it. I knew(知道) three traffic lights: Red lights mean _______. Green lights mean _______. _______ lights mean wait. A sigh on the grass “Keep off the grass” means we shouldn't ________ on the grass.
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