61. The part Always give credit tells us that a leader should _______. (A). give helpful criticism (B). regard others as real heroes (C). praise people for their good performances (D). praise everyone

64.　　　　　　　　　　　　　　　　　　　　　　 The writer uses the two questions at the beginning of the passage to _______. (A). test the readers' knowledge about waves (B). draw the readers' attention to the topic (C). show Jamie Taylor's importance (D). invite the readers to answer them