Why do you choose the place Cheung Chau?Because Cheung Chau is a island, I can leave from city area. Enjoy the travel with my family and not expensive.
lisauchow:
Why do you choose to live in Cheung Chau ?
It is because I like to live in an island away from the city and my family and I also enjoy the daily trips by ferry at a reasonable fare.
Because - cannot be used in the beginning of a sentence.
should be an island instead of a island
I would rewrite your answer as follows:
Since Cheung Chau is an island, I can stay away from the city. I can also enjoy travelling with my family and it is not expensive.