I suggested that the students each ________ a plan for the summer vacation.

问题描述:

I suggested that the students each ________ a plan for the summer vacation.

should make(should可以省略)
这道题考查的是虚拟语气,当suggest在句子中的含义是“建议”时,谓语动词要用should+动词原形的形式

make
make a plan 制定计划