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1. This last time she came back to her hometown was 4 years ago.

=> She hasn't............................................................................................................

2. He started working as a bank clerk 3 months ago.

=> He has.................................................................................................................

3. It has been 5 years since we first flew to Singapore.

=> We have................................................................................................................

4. I last had my hair cut in November.

=> I haven't................................................................................................................

5. The last time we called each other was 5 months ago.

=> We haven't.............................................................................................................