She hasn't written to her parents for two years

1. She hasn't written to her parents for two years .
It is ......
2. They started to learn English five years ago .
They have .......
3. I have not met her since 2015.
The last time .....
4. This is the first time my father visited Ha Long .
My father has never .....
5. It is ten years since We ate this food .
We haven't .....