英语补全对话：Don't you think it's a --- of time to feel sorry for

英语补全对话：Don't you think it's a ___ of time to feel sorry for the things that we have lost?
一只小狗因车祸死了,引起一段关于开车与交通事故的对话,最后有一句是：What can we do with this problem?Don't you think it's a __(1)_ of time to feel sorry for the things that we have lost?Cheer up!Let's do something to stop more _(2)___from happening.
（1）处填什么?(2)处填accidents还是accident?