完形填空

Tony is an1boy and he is a good boy. Tony does well2all his lessons. He loves school and he is always active（活泼的）in3. Every time the teacher asks a question, Tony always4his hand quickly. 5his answer is wrong, but the teacher always smiles （微笑）and says," Good, Tony. But is there a better answer6my question? "

One day, the teacher asks the boys and girls a question. " Swallows （燕子） fly to the south before7is coming? " he says. "But why don't cats and dogs do the8?"

Tony lifts （举） his hand as usual.

He gives different toys to different children. "Yes, Johnson?" says the teacher9. Tony stands up and says, "10they have no wings（翅膀）. "