Раскройте скобки и поставьте сказуемые в Past Simple. Переведите. But when I (to arrive) there no one in the officeРаскройте скобки и выберите нужную форму: Past Simple или Past Perfect. Переведите. The economist (to work) in our department for ten years. That contract that you (to sign) (to be) profitable for our company.

1). But when I arrived there was no one in the office. - Но когда я приехал, в офисе не было никого.

Past Simple in both parts.

2). The economist had worked in our department for ten years. - Экономист десять лет работал в нашем отделе.

Past Perfect.

3). That contract that you had signed, was profitable for our company. - Тот контракт, который вы подписали, был прибыльным для нашей компании.

Past Perfect and Past Simple.