Here are the sentences rephrased using the provided words in parentheses:

1. **It's unnecessary for us to buy meat. (need)**
**We don’t need to buy meat.**

2. **Remember to put some green tea leaves into the kettle. (Don’t)**
**Don’t forget to put some green tea leaves into the kettle.**

3. **My friend doesn’t like eating fried chicken. (fond)**
**My friend isn't fond of eating fried chicken.**