Розкрий дужки та постав дієслово у PastPerfectContinuous:
1.They (to discuss) this question for an hour when I came into the room.
2.I (to wait) for this letter for a month when the postman brought me it.
3.My sister (to unpack) her things for half an hour when her friend rang her.
4.He (to serve) in this house for six years when the war began.
5.The students (to write) the test for 20 minutes when their teacher left the classroom.