"подчеркните в каждом из них глагол-сказуемое и определите его видо-временную форму и залог. а) 1. economics is a successfully studying of the material life. 2. we must examine how people have solved this problem. b) 1. a high standard of living was guaranteed by the organiced cooperation of large numbers of people. 2. the problem of starvation is not solver for millions of human beings

1. economics is a successfully studying of the material life. - 

       Present Simple, Active

2. we must examine how people have solved this problem.  

   Present Simple, Active           Present Perfect, Active

1. a high standard of living was guaranteed by the organiced cooperation of large numbers of people.                             Past Simple, Passive

2. the problem of starvation is not solver for millions of human beings

                                        Present Simple, Passive

 а)

1. economics is (Pr. Simple Active) a successfully studying of the material life.

2. we must examine (Pr. Simple Active) how people have solved (Pr. Perfect Active) this problem.

b)

1. a high standard of living was guaranteed (Past Simple Passive) by the organiced cooperation of large numbers of people.

2. the problem of starvation is not solved (Present Simple Passive) for millions of human beings