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.