5. If you ... my grandfather when he was alive, you would understand how much I miss him. *
knew
have known
had known

Generally speaking, the British are in favor of going abroad or spending away from home while having holidays. Subsequently, package holidays, which include transport ticket, accommodation, meals and sometimes excursion or guided couches, have become popular among British people since 1960. However, the British people do not relish organized holidays and go by the own. The situation changed in 1990s and these days people in the U.K. prefer package holidays not only at seaside and resort but also to warmer countries, such as the USA ,Australia, Spain, Greece. Because British people prefer to have a rest two times a year, There are two kinds of holidays nowadays : a relaxing holiday and an "activity" for those who like winter sports ( In Switzerland ). The primary reason of such movement is because temporary climate of the U.K.

1. Our countries are cooperating (pres cont act) in solving major scientific problems.
2. We have improved (pres perf act) the quality of most of our products and we hope to attract new buyers.
3. The scientist was asked (past simp pass) about his publications.
4. All the obligations under the contract will be fulfilled (fut simp pass) in time.
5. Much attention is also being paid (pres cont pass) to developing countries.
1. Наши страны сотрудничают в решении крупных научных проблем.
2. Мы улучшили качество большинства наших продуктов, и мы надеемся привлечь новых покупателей.
3. Ученого спросили о его публикациях.
4. Все обязательства по контракту будут полностью заполнены в срок.
5. Большое внимание уделяется также развивающимся странам.