даны точки М(-1;м;3) и N(5;-2;n), а середина отрезка MN лежит на ОХ . найдите сумму m+n

Chose the correct preposition. Circle

1.It is great to listen on/to/of modern misic.

2.There are a lot of new students in/at/on school.

3.David isat /from/on New York.

4.Yesterday she invited us at/in/to the party.

5.Did you go to the countryside in/on/at October?