根据句意和首字母提示补全单词。
1. —Are your trousers old? —No. They're n ________.
2. My grandfather (爷爷) is eighty. He is very o ________.
3. I like to wear black t ________.
4. Jenny likes to wear a s ________ in summer (夏天).
5. It's cold today. Li Ming is wearing a s ________.