Выбери правильный вариант.1) they didn't understand (each other/one another) 2)did you enjoy(to travel/travel/travelling) 3)would you mind (closing/to close/close)the window? 4)can i (speak/speaking/to speak) to paul? 5)classmates helped (each other/one another) in that difficult situation.
2)travelling
3)to close
4)speak
5)one another