题目内容：

let's go and ask the policeman.M＿ he knows where the bus station is
2.A＿ he studies hard,he is not good at math
3.The little girl s＿ nine hours every night

优质解答

Maybe,也许.
Although,让步状语从句,“即使”.
sleeps,睡觉,因为是每天晚上,所以用一般现在时.