Last Saturday I was busy _____ my homework and my mother was busy _____ the housewok.

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Last Saturday I was busy _____ my homework and my mother was busy _____ the housewok.
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Last Saturday I was busy _____ my homework and my mother was busy _____ the housewok.
Last Saturday I was busy _____ my homework and my mother was busy _____ the housewok.

Last Saturday I was busy _____ my homework and my mother was busy _____ the housewok.
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