sleep for 20 hours sleep 20 hours 哪一个更正确

sleep for 20 hours sleep 20 hours 哪一个更正确 是it's necessary for us to sleep for 8 hours 还是is' necessary for us to sleep 8 hours? I think it's important for us ____(sleep) eight hours a night.为什么填to sleep? It's not_____(usual) for a student to sleep only 5 hours every night I sleep for nine hours every night The baby _____(sleep) for two hours To sleep for 8 hours every day is very necessary for us.(改为同义句)It's ___ ___ ___ we ___ for 8 hours every day. i sleep for eight hours.中的for必须用吗? _________ necessary for students ________ sleep eight hours every night I____(sleep)for only 3 hours last night sleep、eight、for、day、a、i、hours怎么写成句子 We should sleep at ( ) for eight hours a day I never sleep for less than nine hours.中文是什么? Studdents must sleep for about nine hours every night? I sleep eight hours for every night. 和 I sleep for eight hours every night.哪个对? i believe it's important to sleep fight hours a Let's stay outside for hours and hours. The baby sleep for more than ten hours every day 对划线部分提问：for more than ten hours