Viết lại câu: The last time we saw her was on Christmas day

the last time we saw her was on Christmas day.
=> we haven't.....
i haven't eaten this kind of food before.
=> this is........
it started raining an hour ago.
=> it has...
i have studied Engish for three years.
=> i began.......
my brother hasn't seen his best friend for nearly five years.
=>it's...