32.
(A) without a question
(B) without a doubt
(C) without a scratch
(D) without an accident

28. Ignorance of children’s unusual behavior over time may lead to juvenile ______ (A) caution (B) diligence (C) delinquency (D) devotion

29. A ceremony was held in memory of the firefighter who ______ his life for a little girl last year. (A) saved (B) endured (C) sacrificed (D) commemorated

30. The spy was ______ from the country after he was caught and arrested. (A) relieved (B) banished (C) hibernated (D) involved

31. (A) wreck (B) incident (C) event (D) disaster

33. (A) extend (B) extensive (C) exclusive (D) excessive

34. (A) fluttered (B) flattered (C) flirted (D) flared

35. (A) fading out (B) wearing off (C) going off (D) pulling out 

36. What is the main idea of the passage? (A) After two decades of lab research, gene therapy in humans has been successful in treating everything from cancer to Alzheimer's to heart disease. (B) A lot of research in gene therapy has focused on getting a gene to its destination and coaxing it to turn on once inside a cell. (C) Although research has been done on how gene therapy can help treat serious diseases, such a treatment may cause irreversible side effects and unknown consequences. (D) Viral vectors like Trojan horses slip genes into target cells undetected.

37. "Viral vectors" are _______. (A) ways with which viruses genomes are changed (B) viruses used for carrying genetic material into cells (C) the paths through which viruses move (D) immune reactions triggered by viral infection

38. What does the word "trigger" mean in the passage? (A) Activated (B) Shoot (C) Turn off (D) Plug