Помогите. Требуется открыть скобки в правильном времени)
1)When they (come) to their summer cottage yesterday, their mother already (plant) 20 roses and at that time she (plant) the last flowers.
2) There is so much snow everywhere that he (clean) the yard for an hour.
3)Before Robert (buy) a new car, he (save) money for 2 years.
4)If you ( not like) our service? we (give) you money back.
5)What (listen) you to? - it seems to me I (hear) a strange noise now.