根据短文内容和所给中文提示，在空白处写出单词的正确形式。每空限填一词。

    Bob is a middle school student. He likes reading. He often (花费) a lot of time reading. Last night, he read stories (直到……为止) 11 o'clock. This morning, he fell (睡着的) before class. When the teacher (进入) the classroom, he (注意到) him. The teacher went (朝……方向) him, and woke him up. " (多么) a poor boy!" his teacher said. "You are so (劳累的). You must go home to have a good rest." Bob said sorry to the teacher and (承诺；保证) to go to bed earlier. It is (重要的) for students to have enough sleep.