根据下列句子及所给汉语注释或通过上下文，在答题卡上标有题号的横线上，写出空缺处各单词的正确形式。每空只写一词。

38. Although you are young , you can           (仍然) make the world more beautiful in your own way .

39. Our government has made laws to           (限制) air and water pollution .

40. The artist always            (表达) his world view in his works .

41. Now is the time for all Jazz            (迷) voices to be heard .

42. As the saying goes , “God helps those who help            (他们自己) .”

43. Early this morning I was busy            (挖) in the garden to plant trees .

44. Toni Morrison is considered as one of the best writers of the            (第二十) century .

45. ―Do I look nice in this fur coat , Millie ?

― Mom , please don’t buy it , We should have          on wild animals .

46. ―What did you do to celebrate Halloween last ye ar ?

― I           up as Superman and played “trick or treat” .

47. ―How much did you spend on your trip to South Korea ?

― The           of it was 3,500 yuan in all .