6th grade. Unit 2. Lesson 7. A school story

Read a school story about Albert Einstein, a famous scientist. Put the words in brackets in the Past Simple Tense or the Past Continuous Tense. One day Albert Einstein [blank_start]was writing[blank_end] a formula on the blackboard, when he [blank_start]heard[blank_end] a strange sound. The next moment a dark shadow [blank_start]appeared[blank_end] and [blank_start]started[blank_end] to erase the formula. While the shadow [blank_start]was jumping[blank_end] up and down the board, Einstein [blank_start]was looking[blank_end] at it in surprise. Suddenly it [blank_start]disappeared[blank_end]. The scientist [blank_start]turned[blank_end] to the students and [blank_start]winked[blank_end] at them: “Eureka! There [blank_start]was[blank_end] a mistake in the formula. Now it’s correct!”