Помогите пожалуйста, буду благодарна номера 1,2,3,4.

1.1Who    2. who    3.which    4.which    5.who 2.1 there were    2.there was    3.there were 3.1 watched    2 knew    3 invited 4.1  help ... will finish    2 invite ... will go     3 play .... will