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 "Gone with the Wind"

1. Many improvements __ (had been made) in designing space rockets in Russia by the beginning of the 21st century 2. Mendeleev __( described) more than 60 elements 3. Melodramas__ ( are) romances for girls. 4. Vivien Leigh and Clark Gable__ ( stared) in the film "Gone with the Wind"