21. Although she met many difficulties, Helen was not d　　　　　　 . She kept struggling.

20. The v　　　　　　　 　which causes AIDS is called HIV.

19. This disease is t　　　　　　　 　via physical contact.

18. The police are questioning the drivers who may have w　　　　　　　 　the accident.

17. The driver was still c　　　　　　　 　when the doctor reached the scene of the accident.

16. There is a car accident. The injured were sent to the hospital by a　　　　　　　 .

15. – I’d like to book a room for tonight.　　

- Sorry, but we don’t have any rooms __________ at the moment.

　 A. comfortable　　　　　 B. available　　　　　　　　　 C. suitable　　　　　　　　　　 D. able

14. The boy hurried to school, but he __________ so because there were 30 minutes left.

　 A. mustn’t have done B. didn’t need to do　　　　　　　 C. needn’t have done　　 D. mustn’t do

13. Those boys were caught _______ flowers in the garden again.

A. to steal　 　　 　　　 B. stealing　　　 　 　　　 C. having stolen　 　　　 D. to have stolen

12. In some countries, _______ are called “public schools” are not owned by the state.

A. that　　 　　　　　　 B. which　　 　　　 　　　 C. as　　　 　　　　　 　　　 D. what