Английский. подставить чaстицу To

Английский. подставить чaстицу To1) Our scientists are making wonderful discoveries.
2) Glinka composed the opera "Ivan Susanin"
3) This mile will produce large quantities of coal.
4) A railway connects the village with the town.
5) He had found the key before i did.
6) Who has written this article?
7) They were happy that we gave them that book.