couldn't

他不可能是弄坏你自行车的人——他整晚都和我在一起。

He ___couldn't have damaged your bike - he was with me all evening.

那本书上星期不可能在售——它今天才出版！

That book ___couldn't have been on sale last week - it's only come out today!

我们都确信那不可能是什么别的东西，一定是鬼魂！

We were all sure that it ___couldn't have been anything but a ghost!

她完全不在乎考试结果。

She ___couldn't care less about the exam results.

经理对员工的投诉毫不在乎。

The manager ___couldn't care less about employee complaints.

我们完全不在乎明天下不下雨。

We ___couldn't care less if it rains tomorrow.