my sister thinks it's not good to study ___ music on.Li Lei's parents left him __ at home.sp he was a little afraid.
问题描述：
my sister thinks it's not good to study ___ music on.
Li Lei's parents left him __ at home.sp he was a little afraid.
答
in 后边的那个on 应该没有吧
alone
答
my sister thinks it's not good to study __with_ music on.
Li Lei's parents left him _alone_ at home.sp he was a little afraid.
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