First of all, Chinese don't like passive voice (被动语态). Do remember this! Here is the correction. 他被毕业。(He is graduated) 答案：他毕业了。 这个被买了。(this was bought) 答案：这个被someone买了。You can put anyone to replace “someone” in the sentence. For example: 这个被他买了。 这个家被和谐。(this house is in harmony) 答案：这个家很和谐。 你被我们想了。(you are missed by us) 答案：我们想你。 这本书被看了。(this book was read) 答案：someone 看过这本书了。You can put anyone to replace “someone” in the sentence. For example: 我看过这本书了。 这本书被我的老师看了。(this book was read by my teacher) 答案：我老师看过这本书了。 这本书被我的老师写了。(this book was written by my teacher) 答案：这本书是我老师写的。 书被我学习了。(the book was studied by me) 答案：我学过这本书了。 这个被一个中国人买了。(this was bought by a Chinese person) 答案：一个中国人把这个买走了。 一个好美女人再也不被看了。(Such a beautiful woman was never again seen) 答案：再也没见过那样美的女子了。

He is graduated 他毕业了 这个家庭很和谐 这本书是我们老师写的 You are missed by us can be said by 你被我们想了， but it is very weird. No Chinese says in this way. You should say 我们很想你 And 这本书被我们看了 is weird too, it makes sense and we know the meaning, but this is very inappropriate to express in this way. The same to 这本书被老师看了. 书被我们学习了 not only doesn't make sense but sound weird. When using passive voice in Chinese, you should know when you can't use it and when you shouldn't use it. The rest is right.