请问“_____（laugh）is one of the best medicine”这里应该用laugh的什么形式?l

Who laugh the last,laugh the best. The best I laugh,I laugh the The Laugh of the laugh on the other side of one's one of the best+动词什么形式 "Who the last laugh,who laughs best! laugh I laugh in the face of danger什么意义 Listen,the girl is_____(laugh) 用括号内的次的适当形式填空 用动词的适当形式 why are you -(laugh) we're going to -(have)the base He likes to tell funny stories to make people__（laugh）.的什么形式 Spring is the best time (travel)应该用这个动词的什么形式填空?