Choose the correct forms

1. I
   [lost|have lost]
   my smartphone just now.
2. She
   [finished|has finished]
   her homework already.
3. Last year Sarah
   [travelled|has travelled]
   to the UK.
4. She
   [started|has started]
   a new job at the office.
5. Why
   [has|was]
   he
   [gone|went]
   to Australia?
6. She
   [mailed|has mailed]
   me twice this week.