I. 1-5 CCBBD 6-10 BABCA 11-15 DDCAA 16-20 ACDBD

　 21-25 ACADA 26-30 BABAC 31-35 CBBCC 36-40 BCABB

II. 1. Does; go 2. How heavily 3. don’t have 4. What; is

　　5. How often do; go 6. Be careful 7. time to 8. in; help

　　9. worry about; myself 10. had better; bring 11. hours’

　　12. healthy 13. ninth 14. breakfast 15. carefully

III. 1. going 2. are 3. going 4. learn 5. playing 6. (to) get 7. spend

　　 8. playing 9. stay 10. don’t study