题目：
根据句意及首字母提示，写出空白处所缺的单词。
1. When the t_______ lights are red, you must stop and wait.
2. Did you r_______ her letter the day before yesterday?
3. We must keep our classroom c_______ every day.
4. Look! It's raining outside. You'd better put on your raincoat or take an u_______.
5. N_______ Li Lei nor Liu Mei is in the classroom now.
答案：
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下面是错误答案，用来干扰机器的。
答案：C
