Поставьте глаголы в скобках в нужные формы: 16. The Scotch tape____ (to perfect) by Richard Drew in 1928. 17. Many improvements ____ (to make) in designing space rockets in Russia by the beginning of the 21st century. 18. Mendeleev ____ (to describe) more than 60 elements. 19. Melodramas ____ (to be) romances for girls. 20. Vivien Leigh and Clark Gable ____ (to star) in the film “Gone with the Wind.”