根据汉语或首字母提示写出单词，使句子完整。
1. In a week, we have English lessons every day except W________.
2. Mr.Zhang and Mr. Lin live next door to us. They are our n________.
3. There are so many new words in the ________ (四十九) lesson. It's hard to understand.
4. It is not ________ (自然) for a child of his age to be so quiet at home.
5. Students should pay enough attention to their ________ (发音) when they speak English.
