不要在没有证据的情况下做出这样的假设。

Don't make such a ___presumption without evidence.

他未经允许就擅自使用我的电脑，真是胆大妄为。

He had the ___presumption to use my computer without asking.

法律上存在一种推定，即父母有抚养子女的义务，除非有相反的证据。

There is a legal ___presumption that parents have a duty to support their children unless proven otherwise.