3 . The United States, unlike other countries, doesn’t have “national holidays” that must be ________by all people.

A．appointed

B．reserved

C．illustrated

D．observed

4 . 词性转换
1. ________ vt. 帮助；援助→________ n．助手；助理→________ n．帮助
2. ________ vi.&vt. 抱怨；发牢骚→________ n．抱怨
3. ________ vt. 回答；回复　vi. 做出反应；回应→________ n. 反应；回答；回复
4. ________ vt. 任命；委派→________ n．任命；约定→________ adj. 约定的；指定的
5. ________ vt. 接替；取代；更换→________ n．取代
6. ________ vt. 选举；推选→________ n. 选举；推选；当选
7. ________ vt. 惊吓；使害怕　vi. 受惊吓→________ adj. 害怕的；对……感到惊慌或恐惧的→________ adj. 令人害怕的
8. ________ vt. 拒绝接受；不录用→________ n. 拒绝接受；否决
9. ________ vi.&vt. 退休；退职；退出→________ n. 退休→________ adj. 退休的
10. ________ adj. 精力充沛的；充满活力的→________ adv. 精力充沛地→________ n．精力

9 . The Web is a minefield (雷区) where you can literally be bullied to death via social media, and a loose text can ______ your reputation.

A．appoint

B．limit

C．ruin

D．fade