They thought they might (14) ____ because there's not enough food, (15) ____or oxygen on Mars.

他们认为他们可能(14)____，因为火星上没有足够的食物、(15)____或氧气。

youdao

They thought they might (14) ____ because there's not enough food, (15) ____or oxygen on Mars.

他们认为他们可能(14)____，因为火星上没有足够的食物、(15)____或氧气。

youdao