I think is necessary for us to sleep for eight hours everyda

I think it's important for us ____(sleep) eight hours a nigh i sleep for eight hours.中的for必须用吗? it is n_ for you to sleep eight hours every day. To sleep at least eight hours every day is very necessary fo I think it is necessary for us keep a d_____ every day students n＿＿＿ sleep for eight hours We should sleep at ( ) for eight hours a day It is necessary for us to have___good vocabulary of english. li is necessary for us to learn English well now. It is necessary for us not to eat fast I don't think it is necessary for you to attach great import i think it is necessary for children to communication with p