42. The more significant your pet was to you, _____ the emotional pain you’ll feel. (A) intenser (B) the more intense (C) the most intense (D) more intense

40. Scientists say feral pigeons are a valuable way of probing contaminants in environment, ___ they are exposed to the same air, water, food and other factors as humans, and don’t venture far from home. (A) although (B) hence (C) because of (D) since