Finish each of following sentences so that its meaning stays same

Finish each of following sentences so that its meaning stays same:
1) the last time i went to ho chi minh city was ten year ago
-  it has been.......................................................................
2) this is the most interesting novel i have ever read
- i have......................................................................
3) this is the first time i have been to bangkok
- i haven't..........................................................
4) i started learning english 10 year ago
- i have.....................................................
5) it has been ages since i last saw him
- i have......................................................
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