on the wall?

"How many+主语（复数）+are there…?

How much+主语（不可数）+is there…?"如：

There're three people in my family. 

My name is Chen Lan. My home is in Gulangyu. Where is Gulangyu, do you know? It is in Xiamen. It is near the sea (海). Gulangyu is a small place(地方), but it is very nice and clean. There are no cars, buses or bikes. People only walk. So it is very quiet (安静的). My house is in the center of Gulangyu. Behind my house there is a big old tree. My grandfather tells me the tree is very old. There are many birds in the tree. We call it a "bird tree".

My house is near the sea. The sea is big and blue. There are many fish in the sea. After school, I often go there and catch fish with my friends.    It is very interesting. I like eating and catching fish.

A: 

B: Yes. I want to rent(租) a house.

A: Oh, there is one for rent.

B: Really? 

A: Yes, and it's very clean.

B: Well. 

A: It's about ¥800.

B: OK. Do you know the telephone number?

A: 

B: All right. 

A: You're welcome.