" in advance" is the word to be filled in the blank. But the sentence means we pay first then order, it doesn't make sense.
We don't know how much we are going to order, how much should we pay in advance?
23 Haziran 2010
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!