mary goes to school ___ ___ ____ her ____(背上背着书包)

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mary goes to school ___ ___ ____ her ____(背上背着书包)

mary goes to school ___ ___ ____ her ____(背上背着书包)
mary goes to school ___ ___ ____ her ____(背上背着书包)

mary goes to school ___ ___ ____ her ____(背上背着书包)
mary goes to school with bag on her back

少个a?