Jack can( ) (swim) well.he is good at ( ) (swim)

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Jackcan()(swim)well.heisgoodat()(swim)Jackcan()(swim)well.heisgoodat()(swim)Jackcan()(swim)well.heis

Jack can( ) (swim) well.he is good at ( ) (swim)
Jack can( ) (swim) well.he is good at ( ) (swim)

Jack can( ) (swim) well.he is good at ( ) (swim)
这两个应该是 swim swimming

Jack can(swim ) (swim) well.he is good at ( swimming) (swim)