科学家们仍在研究宇宙的起源。

Scientists are still studying the ___origins of the universe.

尽管他在美国长大，但他的家族起源可以追溯到意大利。

Although he grew up in the US, his family ___origins trace back to Italy.

科学家们仍在研究这种病毒的起源。

Scientists are still studying the ___origins of this virus.