67. The students felt proud of Helios because______. (A) it could run as far as 350 miles (B) it was favored by many children (C) it had high-quality batteries (D) it was driven by clean energy

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.