Краткое пояснение: Выбор между «was» и «were» зависит от числа подлежащего. «Was» используется с единственным числом, «were» — с множественным.
- They were in the Natural History Museum yesterday.
- Nick was taken to the hospital early in the morning yesterday.
- My parents were very tired after their trip to Newcastle.
- Helen was on a ferry boat going to Sweden yesterday.
- The article in the local newspaper was very interesting.
- These houses were built two hundred years ago.
- Last winter was the coldest winter in our region.
- Tom was absent-minded because he had left the keys at school.
- I was on a long trip to the USA two years ago.
- Your e-mail address was very difficult to remember.
- My brother's letters were rather long and interesting.
- Pamela was an excellent ski jumper three years ago.
Ответ: See the solution above.