Task II. Put the verbs into the correct past tense: 19. Alex didn't go to the photographic exhibition because he ... (not/finish) his homework. 20. The research team ... (find) an unusual fossil and took it back to the lab to examine it. 21. Sally ... (paint) for three years before she sold her first painting. 22. It was the first time that Ellie ... (ever/see) pictures of Bigfoot. 23. While Lisa ... (read) a book, her brother was listening to music. 24. Ben ... (gasp) in horror when he saw the ghostly figure. 25. Julia ... (drive) along a country road, when a huge creature came out of nowhere and fell onto her car. 26. We ... (eat) ice cream when we ... (see) a hedgehog under the bench. 27. Nobody was listening while the teacher ... (explain) the tenses. 28. He ... (wake) up and looked at his watch.

Перевод задания: Поставьте глаголы в соответствующее прошедшее время.

19. Alex didn't go to the photographic exhibition because he hadn't finished his homework. (Алекс не пошёл на фотовыставку, потому что не закончил домашнюю работу.)
20. The research team found an unusual fossil and took it back to the lab to examine it. (Исследовательская группа нашла необычную окаменелость и отнесла её в лабораторию, чтобы изучить.)
21. Sally had been painting for three years before she sold her first painting. (Салли занималась живописью три года, прежде чем продала первую картину.)
22. It was the first time that Ellie had ever seen pictures of Bigfoot. (Это был первый раз, когда Элли увидела фотографии снежного человека.)
23. While Lisa was reading a book, her brother was listening to music. (Пока Лиза читала книгу, её брат слушал музыку.)
24. Ben gasped in horror when he saw the ghostly figure. (Бен испуганно ахнул, когда увидел призрачную фигуру.)
25. Julia was driving along a country road when a huge creature came out of nowhere and fell onto her car. (Джулия ехала по просёлочной дороге, когда из ниоткуда появилось огромное существо и упало на её машину.)
26. We were eating ice cream when we saw a hedgehog under the bench. (Мы ели мороженое, когда увидели ёжика под скамейкой.)
27. Nobody was listening while the teacher was explaining the tenses. (Никто не слушал, пока учитель объяснял времена.)
28. He woke up and looked at his watch. (Он проснулся и посмотрел на часы.)

Для действий, завершившихся до другого события в прошлом, использовано Past Perfect; для длительного действия в прошлом — Past Continuous; для завершённых последовательных событий — Past Simple.