In his _____ 【fifty】,he won the Nobel Prize for physics.

He began to learn Chinese in his _____.A.fifty B.fiftieth C.fifties D.fifth In his _____ 【fifty】,he won the Nobel Prize for physics. He paid fifty yuan for his trousers同义句两句His trousers _____ ______ fifty yuanHe ______ fifty yuan ______ his trousers he became a famous writer in his fifty He does his homework at six fifty.(改为同义句）He does his homework at _____ _____ _____. John began to learn English by himself in _____A the fifty B the fifies C his fifty D his fifties he began to work THERE( ) A.on his fifty B.at age of fifty C.when he fifty D.in his fifties说原因 He began to work there ( )A.on his fifty B.at age of fifty C.when he fifty D.in his fifties Though he began to learn English in ______,he is good at it now.A.a fifty B.fifties C.his fifty D.his fifties 为什么答案选D?而在The hero of the story is a soldier in his _____.A.fourty B.forty C.forty's D.forties中却选A. He became a famous writer when he was___选项：A.in his fifty B.in his fifities c.in fifty years old D.in fifties He became a famous writer when he was----------.A in his fifty B in his fiftiesC in fifty years old D in fifties选谁,为什么?谢谢啊 用所给动词的适当形式填空.What _____ his father usually _____ （do）in the eventhing?Forty plus fifty ______ (be) ninety._____ your sister ______ (study) in this school two years ago?_____ you ______ (see) a film this morning?Where _____ There are about eight hundred students and fifty teachers in his school. Mark Twain became famous in his _.A fifties B fifty C fiftieth D the fiftieth He's in his mid-fifties,well,fifty-six,to be后面是to be e_______ He began to work there （ ）.A.on his fifty B.at the age of fifty C.when he fifty D.in his fifties选D,but为什么?每个选项的区别是什么?PLEASE```````` They made _____ _____ fifty hamburgers today. His father _____(works) in school.