A teacher could make classes lively and interested.短文改错

　　A teacher could make classes lively and interested. Once he asked his class to watch carefully first and then do everything he do. He held up one of his finger and dipped it into a cup filled of a mixture. Then he took it out the cup and put a finger in his mouth and sucked it with smile. Then he told the students to do again. Each student made a face after he did that the teacher had done. Finally he saw none of them watched carefully. The finger he sucked was not the one he had dipped into the cup.

　　1.∧classes his 2.interested—interesting 3.he ∧do would 4.finger—fingers

　　5.of—with 6.∧the cup of 7.∧smile a 8.do∧ it 9.that—what

　　10.watched-watch