tom and his friends often swim h_____in it in summer.it is e_____a bone now
问题描述：
tom and his friends often swim h_____in it in summer.it is e_____a bone now
答
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.