1．Our headmaster gave a ____________(有说服力的) speech to persuade students to donate some money for the disaster area.
答案：convincing
2．He is the only survivor of his family who ____________(生存) the train crash.
答案：survived
3．Our friendship has steadily ____________(增强) over the years.
答案：strengthened
4．As she said, “Do you have to be a member of that ____________(组织)？”
答案：organization
