Chọn và giải thích đáp án

GIẢI THÍCH GIÚP MÌNH VÌ SAO CHỌN Đ/Á đấy ạ
50. We need a bag ______ these things in.

      A. put                            B. putting                             C. to put                              D. have put

51. There will be a meeting next week ______ the problem.

      A. will discuss               B. discussed                         C. discussing                       D. to discuss

57. They've just passed their exams. They're having a party ______.

      A. have celebrated        B. celebrating                       C. celebrated                       D. to celebrate
64. I need some new clothes. I haven't got anything nice ______.

      A. wearing                    B. wore                                C. to wear                            D. weared

65. It was difficult _________ a date which was convenient for everyone.

      A. making                      B. to make                            C. make                               D. made