Use the correct pronouns:
Nick`s father always took good care of (1)... car. One Sunday winter morning, when (2)... looked out of the window,(3)... saw much snow had fallen. The car was almost hidden under (4)... .After brekfast he and (5)... son went out to clean the snow. Father began to dig round the car. Nick helped (6)... . They worked a lot. Nick liked to help(7)... father, (8)... enjoyed working and (9)... father`s talk amused (10)... .In this way (11)..were busy for an hour. At last it was possible to drive the car into the street. So Nick``s father got into (12)...”(13)... are a big help to (14)... , Nick, ``(15)... said to (16)... son. ``Thank (17)... , (18)... boy``.