25. He’s new here and didn’t know that you have to stand up and shake hands _____ the visitors. (A) with (B) off (C) to (D) of

35. What are the advantages of tipis mentioned in this passage? (A) Tipis are quite light and cheap. (B) The tipi has a living capacity of more than 10 people. (C) A good tipi can protect people from heavy rains and strong winds. (D) People can use the same tipi for hundreds of years.