英语句子成不成立,I became what i am today at the age of twelve ,on a

At the age of twelve he became __________ in science. 一道英语改写句子I began to study French at the age of four.Now I am at the age of twelve ,Edison began____newspaper on the train He became very i[ ] in music at the age of five "I am a boy,age twelve."有没有语法错误? I am on the top of the world today 一道英语完成填空题I began to study french at the age of four.Now I am i am at my age of 18,standing at the crossroad of my life At the age of eight ,I < > speak a little English. I ___swim at the age of five.A.am able to B.can C.was able D I began to study English at the age of six.Now l am 15 years she began a in badminton at the age of 6 and at last became