1. The article having been read we knew the subject much better.
b) так как статья была прочитана;
2. Having stopped the computer he left the shop.
d) остановив компьютер.
3. The operating machine was installed in the shop.
a) работающая машина;
4. Having installed the new computer we obtained the results of the calculations quicker.
a) установив новый компьютер;