Mark the letter A, B, C or D to indicate the correct answer to each of the following questions

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
5. John managed ________ his family in England by using Zalo.
     A. contact                          B. to contact                      C. contacting                     D. to contacting
6. They ________ about video conferences at this time next Monday.
     A. will talk                                                                   B. are talking
     C. will be talking                                                         D. are going to talk
7. Tree leaves ________ to wrap things.
     A. should used                                                             B. should been used
     C. should be used                                                         D. should be use
8. With the advance of the science and technology, our life changes greatly in various ________
     A. scenes                           B. fields                             C. sights                             D. regions