Much _________ our regret, we can not insure the shipment for 13

Much _________ our regret, we can not insure the shipment for 130% _________ the invoice value.
【正确答案】：to, of
【题目解析】：to one's regret令人遗憾的是句意：很遗憾，我们不能按发票金额的130%为这批货物投保。