2) (The, A, - ) milk was sour so l threw it away.
3)(The, A, - ) chocolate is made of (a, the, - ) cocoa butter. ​

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;

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