给下列句子选择合适的疑问代词填空。
what  where  when  why  who  whose how  which
（1）______ is your little brother’s name? He is Sam.
（2）______are my story books ? They are under your bed?
（3）______does she come to Beijing ? She comes to Beijing by plane.
（4）_______boy is her cousin? The boy in black coat.
（5）______do you come home? At five o’clock.
（6）_______do you visit Summer Palace? Next summer holiday.
（7）_______don’t go to bed now? Because I want to read stories.