39. Which of the following is the most important value described in the passage? (A) Service. (B) Health. (C) Donation. (D) Friendship.

43. Which of the following is NOT true according to the passage? (A) The shape of a blimp is supported by a metal frame. (B) Only the ground crew is needed to make a blimp fly. (C) A blimp needs a small engine to decide its direction. (D) Helium makes it possible for a blimp to rise.