Leaves,flowersandfruitaretheirfood.(Leaves,flowersandfruit划线部分提问）Peopleinsomecountriescookfoodwithwood.(一般疑问句）第一题到底用is还是are.第二题some要不要改成any

Question

Leaves,flowers and fruit are their food.(Leaves,flowers and fruit划线部分提问）
People in some countries cook food with wood.(一般疑问句）
第一题到底用is还是are.
第二题some要不要改成any

Answer 1

What is their food?
DO people in any countries cook food with wood?
就我来看,第一题还说用is,因为food是不可数名词,而第二题考虑了一下觉得用any比较好,因为是问句.