----The goods presented in these museums can tell us what the city used to and we can have a better understanding of the local culture. "what the city used to..." is incorrect. Perhaps you mean "what the city used to be like...", "what the city was like in the past..", or "what kind of goods the city used in the past..." This is because it is not clear to what you are referring when you say "to". ----Sometimes, the museums may exhibit some arts painted by foreign artists, which is a good chance for us to learn different cultures. "may exhibit some arts painted by..." This sounds strange because "art" cannot be singular or plural when talking about objects or products. It is a group or collective. "Art" refers to all of the products created. I have a single sculpture, which is called "art". The museum has hundreds of paintings and sculptures, which are called "art". When talking about the action or process, it can be singular or plural. The process of creating a painting is called "an art". Sculpting is also "an art". Together, these are " two arts". ----I feel that museum act like a teacher, who is rich in knowledge It would be better not to use a comma here. This is one continuous thought, but the comma makes it seem like one is kind of separate from the other. The museum as a "teacher rich in knowledge", not the museum as "a teacher" and the teacher "rich in knowledge". ----He tells you that what the world was like before modern technology and he passes on wisdom of our ancestors to you to make you full of knowledge. I wouldn't say "make you full of knowledge". This is strange because "knowledge" is very general. It is similar to saying "make you know everything". You cannot know everything unless you are god. Instead, say "make you full of knowledge about the arts." This is better because at least "knowledge" is limited to "about the arts".

I recommend you post this as a "notebook" entry because it will then be easier for tutors to correct it.