1. open the brackets, using past simple or past continious. 1)when i (come) home, my little sister (sleep). 2)when nick (come) home, his brother (play) with his toys. 3)when mother (come) home, i (do) my homework. 4)when father (come) home, pete (sleep). 5)when father (come) home, the children (play) on the carpet. 6)when i (get) up, my mother and father (drink) tea. 7)when i (come) to my friend's place, he (watch) tv. 8)when i (see) my friends, they (play) football. 9) when i (open) the door, the cat (sit) on the table. 10)when kate (open) the door, the children (dance) round the fir-tree.

По своему опыту думаю что так.
1) When I (come) home, my younger sister (hibernation).
2) When Nick (come) home, his brother (play) with their toys.
3) When the mother (to come) home, I (do) homework.
4) When the father (to come) home, Pete (hibernation).
5) When the father (to come) home children (play) on the carpet.
6) When I (get), my father and mother (drink) tea.
7) When I (come) to my friend, he (watch) TV.
8) When I (see) my friends, they (play) football.
9) When I (open) the door, the cat (sit) on the table.
10) When Kate (open) door, children (dance) around the tree.