Question

Подставить if, unless, provided или as long the kidnappers won't release the child_____the ransom is paid.​

Answer 1

unless правильный ответ)

Answer 2

To complete the sentence, you can use "unless" or "until":

1. ... the kidnappers won't release the child unless the ransom is paid.
2. ... the kidnappers won't release the child until the ransom is paid.

Both options convey the idea that the child will only be released once the ransom is paid.