1. was cooking / My sister / dinner / in the kitchen / when I arrived
✓ My sister was cooking dinner in the kitchen when I arrived.
2. will travel / Next summer / we / to Japan / with our family
✓ Next summer, we will travel to Japan with our family.
Alternative: We will travel to Japan with our family next summer.
3. Were / you / studying / at the library / when I called?
✓ Were you studying at the library when I called?
4. will be working / At 3pm tomorrow / I / on my presentation / in the office
✓ At 3pm tomorrow, I will be working on my presentation in the office.
Alternative: I will be working on my presentation in the office at 3pm tomorrow.
5. bought / Last week / she / a new laptop / from the electronics store
✓ Last week, she bought a new laptop from the electronics store.
Alternative: She bought a new laptop from the electronics store last week.
6. What / will / you / be doing / at the beach / this time tomorrow?
✓ What will you be doing at the beach this time tomorrow?
7. was reading / I / a book / in the library / when the fire alarm went off
✓ I was reading a book in the library when the fire alarm went off.
8. Where / will / he / send / the report / tomorrow morning?
✓ Where will he send the report tomorrow morning?
9. were playing / They / soccer / at the park / all afternoon yesterday
✓ They were playing soccer at the park all afternoon yesterday.
10. When / were / they / playing / soccer / at the park?
✓ When were they playing soccer at the park?