by vs through

[sergoat]

Should I use by or through in these examples?

My house is heated by/through gas
I'll send it to you by/through mail
I'll pay you by/through check
I learned that by/through a lot of practice
Success only happens by/through hard work
The tickets are available by/through the Internet

I would appreciate any help you can give me.

Thank you very much.

[marcchehab]

Hello

My house is heated by/with gas
I'll send it to you by/through mail
I'll pay you by check
I learned that with a lot of practice
Success only happens through hard work
The tickets are available through/on the Internet (or just on-line)

There are really so many possibilities. It always depends what you want to say.