Необходимо избрать подходящий вариант ask 3. Choose the correct answer (5

Нужно выбрать подходящий вариант ask 3. Choose the correct answer (5 points). 1. They didnt 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.