题目：
根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。
1. He went to bed very late yesterday, so he o this morning.
2. I'm afraid I have to r , or I'll be late for class again.
3. Don't forget to 1 the door when you leave.
4. His watch b down. He wanted to buy a new one.
5. On the Spring Festival, we visit our r and friends.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：侧弯反射又称躯干内弯反射。婴儿处于俯卧位或俯悬卧位，用手指刺激一侧脊柱旁或腰部。婴儿出现躯干向刺激侧弯曲。存在于0～3个月。
