C. Выбери правильный вариант (обведи или подчеркни): When I arrived / was arriving, they had / were having dinner. She cleaned / was cleaning her room while he fixed / was fixing the car. I saw / was seeing a cat when I walked / was walking home. At 10 p.m. last night, I studied / was studying for my exam.

Перевод задания: Choose the correct option (circle or underline it).

1. When I arrived, they were having dinner.
   Когда я приехал, они ужинали.
2. She was cleaning her room while he was fixing the car.
   Она убирала свою комнату, пока он чинил машину.
3. I saw a cat when I was walking home.
   Я увидел кошку, когда шёл домой.
4. At 10 p.m. last night, I was studying for my exam.
   Вчера вечером в десять часов я готовился к экзамену.

Past Simple употребляется для завершённого события, а Past Continuous — для действия, происходившего в определённый момент или одновременно с другим действием.