37. The new study, _______ in the BMJ’s Vet Record, looked at dog and cat food commercially available in the Netherlands. (A) publish (B) published (C) publishing (D) publishes

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