Write the second sentence

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Ex 7. Write the second sentence so that it has a similar meaning to
1. The last time we saw her was on Christmas Day.
We haven't ......
2. I haven't eaten this kind of food before
This is
3. When did you start to learn French?
How long.....
...
......?
4. My father started to give up smoking last year.
→My father has......
5. I have studied English for three years.
→I started.