tom and his friends often swim h_____in it in summer.it is e_____a bone now

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tom and his friends often swim h_____in it in summer.it is e_____a bone now

1. happily
2.如果上面两句是连着的,不知道; 如单独一句,可以是eating, 它(比如a dog)正在啃一根骨头.