they didn't ask for any pay;they all did it for free合为一句
问题描述：
they didn't ask for any pay;they all did it for free合为一句
改为用without把两句合为一句,每空一词
they did it _____any _____.
答
bekoz "they didnt ask for any pay",so they didn't charge anything.
所以正确答案应该是：
without charge
They did it without any charge.
charge 可以做名词,收费,费用的意思.