30. He is an expert in language analysis. He is _____ in analyzing languages.(A) proficient (B) harmonious (C) sufficient (D) cautious

39. What do the study authors suggest about the interaction between asthma, sleep,and depression?(A) It is well understood and requires no further research.(B) Further research is needed to understand the mechanisms behind theseinteractions.(C) Sleep and depression have no impact on asthma.(D) Asthma causes sleep and mood disorders in all patients.