Put the verbs into the right tense 1. Many improvements __

Put the verbs into the right tense 1. Many improvements __ (to make) in designing space rockets in Russia by the beginning of the 21 st centure 2. Mendeleev __(to describe) more than 60 elements 3. Melodramas__ ( to be) romances for girls. 4. Vivien Leigh and Clark Gable__ (to star) in the film quot;Gone with the Windquot;