她在整理旧照片时意外发现了祖母的日记。

She ___discovered her grandmother's diary while organizing old photos.

他惊讶地发现自己竟然忘记带钥匙了。

He ___discovered to his surprise that he had forgotten his keys.

科学家在2020年发现了一种新的海洋生物物种。

Scientists ___discovered a new species of marine life in 2020.