Put in each other or one another 1)they didn't understand . 2)we'd like to talk to . could you wait for us a few minutes? 3)the twins usually live with and help . 4)why are you looking at . would you like to tell me anything? 5)in a team people have to support . 6)do you write letter to ? 7)language helps us to communicate with .

1)They didn't understand EACH OTHER.
2)We'd like to talk to EACH OTHER. Could you wait for us a few minutes?
3)The twins usually live with EACH OTHER and help EACH OTHER .
4)Why are you looking at EACH OTHER (ONE ANOTHER). Would you like to tell me anything?
5)In a team people have to support ONE ANOTHER .
6)Do you write letter to EACH OTHER ?
7)Language helps us to communicate with ONE ANOTHER .
EACH OTHER употребляется, когда речь идёт о двух людях(существах).
ONE ANOTHER употребляется, если речь идёт о количестве людей(существ) более двух.