... exam.18.Mai studied very hard, she passed the exam very easily. 19. It was very cold last night, we went out for a walk. Exercises Unit 9- 10 English 1220.It was very cold last week, we had to cancel ... C. will have taken D. may take Exercises Unit 9- 10 English 128. You ___ ring the bell; I have a key.A. mustn’t B. needn’t C. couldn’t D. shouldn’t 9. It must ___ without delay.A. be done B. ... Exercises Unit 9- 10 English 12BUT, SO, HOWEVER and THEREFORE Exercise 1: Add so, but, therefore, however where...