Passage 3

　　A teacher could make classes lively and 1. ___________interested. Once he asked his class to watch 2. ___________carefully first and then do everything he do. 3. __________He held up one of his finger and dipped it 4. ___________into a cup in a mixture. Then he took it 5. ___________out the cup and put a finger in his mouth 6. ___________and sucked it with smile. Then he told 7. ___________the students to do again. Each student made a 8. ___________face after he did that the teacher had done. 9. ___________Finally he saw none of them watched carefully. 10. __________The finger he sucked was not the one　he had dipped into the cup.

　　Passage 3

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

　　5. in—with 6. ∧the cup of 7. ∧smile a 8. do∧ it 9. that—what 10. √