While I admit that English words keep escaping from our memory, constant ______ to them not only increases our understanding of them, but likely plants them into our mind.
48. Some new changes happened _____ the school _____ my absence.
47. She was disappointed _____ hearing the news that Chinese football team lost the first match in “World Cup”.
46. _____ his disadvantage, it began to rain heavily suddenly.
45. The twins look much like each other, but they are different _____ nature.
44. _____ the _____ of modern industry, the pollution is becoming more and more serious.