谈论健康生活习惯 — 英语填空题
题目
Read the rule and fill in the blank: Tom wants to be healthy. His doctor says he should sleep 8 hours every night. Yesterday Tom went to bed at 10:00 p.m. and got up at 6:00 a.m., so he slept ___ hours. That means he followed the doctor's advice. (填一个英文数字单词)