70. For some young people, arriving on time for a students' party will probably be considered_______. (A) very difficult (B) particularly thoughtful (C)friendly and polite (D) socially unacceptable

72. What is the general idea of the text? (A) It' s safe to arrive late just when food is served (B) It' s wise to eat something before going to a party. (C) It' s important to follow social rules of party-going. (D) It' s necessary to read invitations carefully.