these plants will produce food and oxygen(改为被动语态).

these plants will produce food and oxygen(改为被动语态).
these plants will produce food and oxygen(改为被动语态).

these plants will produce food and oxygen(改为被动语态).
Food and oxygen will be produced by these plants.

Food and oxygen will be produced by these plants.
一般将来时的被动语态：will+be+P.P.（过去分词）

Food and oxygen will be produced by these plants!