I'd say the first one is right

A letter to a friend

Dear Elena,
How are you? Thanks a lot for your last letter asking about coming to Millwall College. I really appreciate the idea of improving your English in this way. Don’t be afraid because you won’t be lonely at all. I’m sure you’ll make plenty of friends in a few days.
When I came here for the first time I was also worried about loneliness but it turned out to be unnecessary. I made a brilliant friend on the first day of my stay! Her name is Luiza and we’ve been living in the same room from the beginning. She’s a wonderful person. I love chatting with her and listening to her witty jokes.
That brings me to free time. We get plenty of it, by the way, and I’ve already visited a few interesting places near our college. A week ago Luiza and I also joined also dancing classes. We go there almost every evening and enjoy ourselves. Don’t worry that it’s your summer holiday. You’ll have enough free time to relax in a proper way.
When it comes to your last worry, I must admit that college is quite expensive but we’ve got professional teachers here. One of them is Maria who I have lessons with. She’s taught in different schools, so she’s pretty experienced. What’s more, she’s also travelled a lot and she’s told us a lot about life in different countries where people speak English.
Take up this course at my college. I’m sure you won’t regret it!
Best wishes,
Julia

http://french.about.com/od/grammar/a/preposition_de.htm

The Snow

I'm in I live in the south of China so I hardly ever see snowing. But this morning when I woke up at 7, I noticed that the view outside my window looks looked different, it's a white world! The snow outside is not very heavy but it made me really happy. I wish it would be a heavy snow next year. I hope it will snow more heavily this year

"the plane is to fly" doesn't make sense to me, but it is a very formal way of saying "the plane is/will take off"

Which bike is yours? (They will respond: it's the 4th one along, for example)

It should be "you are" obviously. "You is" is, I guess, slang. It is used here because it rhymes with "this", but many people do say "you is" in real life. Not to be racist or to generalise, but it's typically Black people that say it - it's very informal.