Chọn từ sai

47. Measles are a common disease which many children catch every year.   

                       A          B                       C                             D

48. Neither of the girls have turned in the term papers to the instructor yet.                 

         A                   B     C                                                                        D

49. No sooner had the wind stopped blowing when it started to rain heavily.

                   A                             B                      C            D

50. The little girl sitting next to me on the plane yesterday was nervous because she has never flown before.                                 A                         B                                     C                                            D