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11.One day when Edison was five years old， his father saw him ____ on some eggs. A.siting B.sitted C.sitting D.sat 12.Everybody is busy ____ ready for Christmas and buy Chiristmas presents. A.get B.getting C.to get D.got 13.She was often heard ____. A.sing B.singing C.sung D.to sing 14.Our teachers told us ____ hard. A.to work B.working C.worked D.work 15.Could you tell me ____ this word? A.to how read B.how to read C.how read D.how read to 16.I dont know ____ . A.when start B.when to start C.to how start D.how start 17.Please give me a pen ____ . A.to write B.writing C.to write with D.written 18.He went home ____ some books. | 
