Question

Употребите глагол,данный в скобках,в указанном времени
1 Russian scientists (to make) a remarkable contribution to the study of the theory of numbers and probability theory (present perfect)
2 Before world war II people (to have) television sets (past indefinite)

Answer 1

1. had made
2.past indefinite?это simple?

Answer 2

1.Russian scientists has made ...
2.Before world war 2 people had...