Mary is very young ,but she knows a lot

Mary is very young ,but she knows a lot Mary is girl,but she knows a lot about science. She is young but she knows a lot of.这句话哪里错了? Although/thangh he is young but he knows a lot这个病句怎么改? Little Tom knows a lot of things t_____ he is very young. __he is very young,___he knows a lot about how to be healthy Mary is very young.She can't ride a bicycle.Mary is ____ you ______ My younger brother is very younger,but he knows a lot young he is ,he knows a lot about the world Young man as he is,he knows a lot. She knows a lot about Chinese food very much./翻译 1.She is young,_____she konws a lot.A.and B.or C.but D.so