在她提起之前，我已经完全忘记了她的生日。

I had totally ___forgotten her birthday until she mentioned it.

她到办公室才发现把钥匙忘在家里了。

She arrived at the office and realized she had ___forgotten her keys at home.

这个重要的历史事件在教科书中被忽略了。

This important historical event was ___forgotten in the textbooks.