A.Put in the correct tense of the verbs in brackets:
1.When....he(leave) Hanoi for HCM city?
-He....(leave) yesterday morning
2.They....(start) to learn EL when they.....(be) only 10 years old
3.she....(play) the piano when we.....(arrive)
4.what you.....(do) at 8 o'clock yesterday when he...