_____ the boy is to learn to talk！

　　A. too clever B. so clever C.clever enough D. enough clever

　　A.help B.to help C.for help D. for helping

　　A.Cant B.mustnt C. neednt D. may not

　　A. to practice to speak B. to practice speaking

　　C. practicing to speak D. practicing speaking 

　　A. to tell， to remember B. telling， remember

　　C. tell， to remember D. to tell， remember

　　A. dress B. make C. put on D. wear

　　A. to write B. writing C. write D. writes

　　A. plays B. to play C. play D. playing

　　A. to do B. done C. do D. not to play

　　A. the writer was very successful in his life

　　B. the writer didnt reach the top of the mountain

　　C. though the writer was young， he could understand his father

　　D. the writer used to stop half-way when he climbed the mountain