He( )( )( )(忙于)his homework

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He( )( )( )(忙于)his homework

He( )( )( )(忙于)his homework
He( )( )( )(忙于)his homework

He( )( )( )(忙于)his homework
is busy with
忙于某事

is busy with

is busy with

is busy with

engage himself in