Ответ:

Перевод задания: Раскройте скобки, поставив глаголы в Past Simple, Past Continuous или Past Perfect.

We arrived at the station. The train had not come yet and a lot of people were waiting at the platform.

Мы приехали на станцию. Поезд ещё не пришёл, и многие люди ждали на платформе.

Ответ: arrived, had not come, were waiting.