完形填空。 Mark Twain was pen name of Samuel Lamghorne Clemens.He was born on November 30,1835,in a  small town in  Florida ,the USA/He ___ 1 ___a few naughty boys who later ___ 2 __ in his tories. At the age of 12,his father died,and he  began to work,first as a  printer,then on a river boat .Those years on the boat went into his book“Life ___ 3 ___the Mississipi”。 ___ 4 ___the Civil War he worked as a reporter and used Mark Twain as his  pen name .The stories he wrote in this period ___ 5 ___him famous and popular. He made  lot of  money by writing ,lecturing and running ___ 6 ___publishing house .But he spent all of it on high living and  ___ 7 ___ bisiness. Mark Twain ___ 8 ___as a 'funny man '.But in fact he took a serious view of life . Many sad things happened in his own life .All his ___ 9 ___ helped to shape his stories ___ 10 ___ showed the dark side of society. He died as an  old man of 75 in 1910. (     )1.A.grew (     )2. A.turned (     )3. A.on (     )4. A.While (     )5. A.made (     )6. A.him (     )7. A.success (     )8. A.knew (     )9. A.challenges (     )10. A.who B.grew up B.became B.in B.During B.kept B.himself B.successful B.was known B.experiences B.where C. grew up with C.appeared C.at C.For C.served C.his C.successfully C.was knowing C.happiness C.which D. grew up in D.disappeared D. for D.Since D.encouraged D.his own D.unsuccessful D. was to be known D.sadness D.in which