Each sentence has four underlined words or phrases marked A, B, C and D. Choose one underlined word or phrase which has a mistake and must be changed to make the sentence correct. Example: (A)The amino acids (B)serve (C)as the building (D)block of proteins. - D 1. It (A) has long been known that an entire (B) cluster of galaxies may sometimes (C) lie buried within a vast, (D) dence ball of gas. 2. Shops up and down the street (A) were forced to shut their doors as (B) less people now (C) frequented (D) neighbourhood businesses and restaurants in the evening. 3. In nature, cats are (A) nocturnal animals; (B) that is, (C) its most active period of the day (D) is at night. 4. (A) Several computer models have been able (B) to succeed predict global (C) climatic changes well (D) in advance of their occurrence. 5. (A) Father evidence is needed to support research that (B) suggests that certain chemicals in broccoli and (C) other members of the cabbage family may act as cancer (D) preventatives.