We keep food cold in fridge.(改为被动语态）

We must keep the air in the room clean.(改为被动语态） 1We should keep the food at a low temperature.被动语态 The food 连词成句 cold keep fridge the can food 英语被动语态转换快1)We should plant trees in spring.(改为被动语态）Trees in Thet keep the animals in tiny cages.（改为被动语态） We planted many flowers in the neighborhood改为被动语态 we heard them sing in shanghai 改为被动语态 will we finished work in two days?改为被动语态 we clean the classroom in the afternoom 改为被动语态 We plant many trees in spring every year （改为被动语态） We can finish the work in two days.(改为被动语态） We speak only English in English class.（改为被动语态）