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 _____.

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 _____.
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 _____.

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 _____.
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.

without, charge

they did it without any payment.

without payment