Here are the correct answers for each blank in the text:

1. **with** (I live in California **with** my family.)
2. **is** (there **is** a big living room)
3. **lots of** (there are **lots of** trees)
4. **next to** (My bedroom is **next to** my parents' bedroom)
5. **next to** (There are two chairs **next to** the desk.)

So the filled passage would be:

"Hi! I'm Mark. I'm 15 years old. I live in California **with** my family. This is my house. It is very big. There are two floors. On the ground floor, there **is** a big living room, a dining room and a beautiful kitchen. On the first floor, there are three bedrooms and two bathrooms. There is a big garden, and there are **lots of** trees there. My bedroom is **next to** my parents' bedroom and the bathroom. There is a desk next to my bed and there are two chairs **next to** the desk. There are two lamps on the desk and the computer is between the lamps."