16. Malala Yousafzai, a seventeen-year-old teenager, is ________ Nobel Prize winner in history.

　　A) young               B) younger            C) youngest       D) the youngest

　　17.The two girls seem to become ________ to each other than before after the competition.

　　A) close                   B) closer                C) closest               D) the closest

　　18.The stampede (踩踏事件) which happened at the Bund area is ______ disaster to hit Shanghai     in recent years.

　　A) bad    B) worse    C) worst    D) the worst

　　19.______ the war lasts, the more the people there will suffer.

　　A) Long    B) The long    C) Longer    D) The longer

　　20.Hainan Island is the second ______ island in China.

　　A) large    B) larger     C) largest     D) the largest

　　21.Though my sister is very cute, she is not so _________ as me.

　　A) confident    B) more confident   C) less confident    D)the most confident