1)at the moment the at the station(arrives/is arriving/will arrive2)the the station two years ago(arrives/arrived/has arrived).3)when i visit moscow i usually the sputnik hotel(stays/is staying/will stay).4) the sputnik hotel(am staying/stayed/have stayed).

1)is arriving
2)arrived
3)stay
4)I have never stayed

Halloween is a celebration on the night of October 31st. It is most practiced in the United States and Canada, unfortunately in Russia this holiday is not as important. Children wear costumes and go to peoples' homes saying "Trick or treat!" to ask for candy (chocolate, hard candy, etc) (sweets in the UK) and people give it to them. The suggestion is: "Give me a treat or I will play a trick on you." People often dress up as ghosts, witches, or other scary things for Halloween. I think it is a great idea.

I was playing a computer game when my mum came home.
I was doing my homework yesterday at 5
I was having a bath when my friend called me
I was reading a book while my father was reading a newspaper
I was doing my homework while my mother was cooking dinner
I was sleeping while my parents were watching TV
I was going shopping when I ran into my friend
I was listening to music when my sister came into my room
I was having lunch while my mother was washing the dishes
I was watering the flowers while my cat was eating its meal.