The sea was___calm__after the storm .The fishermen went out

The sea was___calm__after the storm .The fishermen went out to fish happily..老师说填calm但我觉得这里隐含比较.应该用calmer而且翻译好像也翻译的过去.比暴风雨还要平静嘛.老师说只能用calm另外.
Let's go to the new restaurant on 24th street for dinner tonight
---we can cook it at home .it's less expensive这里老师又说只能填less expensive 求讲解.我又觉得可以填expensive他很贵.纠结.到底怎么填啊.被老师弄晕了