Choose the correct form for the verb in brackets to complete the sentences

Question 3. Choose the correct form for the verb in brackets to complete the sentences
(1pt)
16. Mozart played the piano when he (be)________ three.
A. is B. was C. are D. were
17. My sister (clean)____________ the dishes after dinner last night.
A. cleaned B. cleans C. is cleaning D. cleaning
18. I (brush)________ my teeth every night, but last night I forgot to brush them.
A. brushing B. brush C. brushes D. brushed
19. Why _________ you (leave)_________ the party early last night?
A. do you leave B. are you leaving C. did you leave D. were you leave
20. She (not go) ___________ to school yesterday because she was sick.
A. doesn’t go B. isn’t go C. didn’t go D. didn’t went