- My brother is really good at swimming. He wins races all the time. In this sentence, the correct preposition is "at". We use "at" to show that someone is skilled in a particular activity or subject. So, the sentence means that my brother is skilled in swimming. - Be careful with that vase! In this sentence, the correct preposition is "with". We use "with" to show the instrument or tool that is involved in an action. So, the sentence means that we need to be careful with the vase, as it is fragile and can easily break. - I’m not really interested in music. I listen to it, but I can’t say that it’s my hobby. In this sentence, the correct preposition is "in". We use "in" to show interest or involvement in something. So, the sentence means that I am not really interested or involved in music, even though I listen to it occasionally. - My mum was very proud of me when I passed the English exam. In this sentence, the correct preposition is "of". We use "of" to show the person or thing that we are proud of. So, the sentence means that my mom was proud of me for passing the English exam. - He’s crazy about programming. In this sentence, the correct preposition is "about". We use "about" to show strong interest or enthusiasm for something. So, the sentence means that he is very enthusiastic or passionate about programming. - Peter is brilliant at football. I think he’s got a great future ahead of him. In this sentence, the correct preposition is "at". We use "at" to show skill or ability in a particular sport or activity. So, the sentence means that Peter is very skilled in football and has a promising future in the sport.