Sure! Here are the correct answers to complete the sentences based on the context provided:

1. **B. fashionable**
"Teenagers like to dress **fashionable** but their parents do not always think their clothes are suitable."

2. **D. others**
"Some parents are honest and say politely what they think; **others** get angry and shout that they don't like the clothes."

3. **C. nothing**
"But the best idea is for parents to sit in their chairs and say **nothing**."

4. **A. sensibly**
"They forget that when they were teenagers they did not like to dress differently from their friends and they didn't always choose their clothes **sensibly**."

5. **B. by the time**
"But their opinions changed slowly and **by the time** they were 30, they had started to dress like their own parents!"

So, the completed passage would read as follows:

"Teenagers like to dress **fashionable** but their parents do not always think their clothes are suitable. They look unhappy at their children as they leave their house. Some parents are honest and say politely what they think; **others** get angry and shout that they don't like the clothes. But the best idea is for parents to sit in their chairs and say **nothing**. They forget that when they were teenagers they did not like to dress differently from their friends and they didn't always choose their clothes **sensibly**. But their opinions changed slowly and **by the time** they were 30, they had started to dress like their own parents!"

I hope this helps!