Задание 1. Измените глагол в предложениях в зависимости от событий: Пример:

1) His sister is developing new alloys at the research laboratory all the morning today.
2) His sister developed new alloys at the research laboratory five years ago.
3) His sister develops new alloys at the research laboratory every year.
4) His sister will be developing new alloys at the research laboratory for several hours next week.
5) His sister had developed new alloys at the research laboratory before we came to help her yesterday.