I just couldn't　17    this kid. He's only twelve. I too got my knee unstuck, but not without great 　18    . The excuse for me, however, was not　19    but plain stupidity. I was　20    fifty years old when this happened. 1.A.used　　B.needed　　C.happened　　D.continued 2.A.calm　　B.silent　　C.cheerful　　D.active 3.A.lost　　B.fetched　　C.tried　　D.accepted 4.A.fire　　B.chaos　　C.violence　　D.argument 5.A.described　　B.carried　　C.introduced　　D.sent 6.A.raising　　B.observing　　C.saving　　D.teaching 7.A.happy　　B.doubtful　　C.surprised　　D.confident 8.A.shared　　B.wrote　　C.read　　D.heard 9.A.head　　B.knee　　C.arm　　D.foot 10.A.calculating　　B.explaining　　C.wondering　　D.reporting 11.A.pushing　　B.climbing　　C.walking　　D.kicking