Напишите последующие предложения во множественном, числе : 1. We translated this

1. We translated this article at our English lessons. We translated these articles at our English lessons. 2. Summer wasnt very hot in that part of the country. Summers arent very hot in those parts of the country. 3. Will he present this paper to physical journal? Will he present these papers to physical journals? 4. Take that book off the table.  Take those books off the table. 5. This alloy is very hard.  These alloys are very hard.