50. A. which            B. why             C. how            D. it

49. A. what             B. where            C. when           D. who

48. A. angry            B. glad             C. happy           D. interesting

47. A. early             B. fast             C. quickly          D. late

46. A. to wait           B. wait             C. waited          D. waiting

45. A. other            B. another          C. the other         D. the next