42. What is needed to naturally produce yoghurt, according to the passage?
(A) Equipment and measures.
(B) Warm weather and a traditional method
(C) Specific bacteria and temperature ranges.
(D) State takeover and dairy industry.

38. What does the word "economical" mean?(A) Realistic.(B) Efficient.(C) Current.(D) Inexpensive.

39. What does "them" refer to?(A) Bacteria.(B) Laboratories.(C) Tuberculosis.(D) Researchers.

40. What is the best title for the passage?(A) An effective bacteria-killing system.(B) Does vinegar really kill household germs?(C) How can we fight against infectious diseases?(D) Why vinegar can kill flu virus.

41. What is the passage mainly about?(A) Yoghurt in different Bulgarian regions(B) How to make yoghurt popular, commercial product.(C) Why yoghurt became popular.(D) Bulgarian yoghurt.

43. What does the phrase "in vogue" mean?(A) extensive(B) rare(C) trendy(D) dominant

44. What did the new demand for Bulgarian yoghurt lead to?(A) Yoghurt became an international product.(B) Yoghurt became a national image.(C) Yoghurt became more authentic.(D) Yoghurt became a commercial product.

45. Why is yoghurt important in Bulgaria?(A) It is a traditional product sold to other countries.(B) It makes an essential part of Bulgarian dishes.(C) It creates a big market in other countries.(D) It is profitable to produce home-made yoghurt.

46. Choose ONE grammatically correct sentence.(A) The company remained silent about the faults of its products for more than a week.(B) A computer company said that because there is one major flaw in nearly all chips.(C) The most recent product do not attract enough customers in the neighborhood.(D) The fire in the company caused a huge damage and many people lose their lives.

47. Choose ONE grammatically correct sentence.(A) That a brain injury, can lead to a change of personality proved by the academy.(B) Understanding the rules of the school, the mother waited outside for her girl.(C) Angry, the window of the living room was broken into pieces all around.(D) With a sigh of anger, the broken cups were put back to the shelves.

48. Which sentence is the best "topic sentence" for the following paragraph?__________.She is bald with a silver back. She was invited to TV shows and became a citizen in Saudi Arabia. In fact, Sophia is a robot being able to have interactions with human being. She can throw questions and carry on a conversation in different topics. Dr. David Hanson, the creator of Sophia, is convinced that robots will the ability to think and make judgement. Hanson is confident that Sophia's intelligence will resemble to that of a five-year-old by 2025. Sophia is definitely a revolution of artificial intelligence."(A) Sophia has an eye-catching appearance as a robot.(B) Sophia can make responds and commands if necessary.(C) Sophia is a wonder of the modern society.(D) Sophia surprises people by having different emotions.