15. --- Who are the teenagers gathering at the school gate? --- Well, if you _____ know, they are all my visiting students.
77. According to Property Inheritance Law, the farm shall him on his uncle’s death.
76. In the new program 3+X if your dream to be a doctor , you must take chemistry as elective course.
75. Why don’t you to England for a holiday?
74. The man you _____ in the street is my best friend.
73. She________the children round him and asked them to listen to her attentively.