1.were playing

2.were you doing , were listening

3.was working

4.lived

5.were playing , started

6.was watching , came , watched

7.practived , was playing

8.leaved

9.was coming, were talking

10.attacked ,was walking

\(A=\left\{5;6;8\right\}\)

\(B=\left\{6;8;11\right\}\)

\(C=\left\{5;6;11\right\}\)

\(D=\left\{5;8;11\right\}\)