22.　 hit-hit-hit

hit sb. on the head, hit sb. on the leg, box sb. on the ear (打某人耳光)

21.　 history (n.) 历史→historic (adj.) 历史意义的(加时间点)→historical (adj.) 历史的(考纲)

a historical novel about World WarⅡ 一本关于二战的历史小说

20.　 hesitate (v.) 犹豫，踌躇→hesitation (n.) 犹豫→without hesitation 毫不犹豫

19.　 hear (vi.) 听到→hear from 收到…来信→hear of 听说

18.　 headache/stomachache/backache

17.　 harm (n.) 伤害→do harm to sth./be harmful to→harmful/harmless

16.　 hard (adj./adv.) 硬的→be hard on sb.=be strict with sb./in sth. 对某人要求严格

15.　 happy (adj.) 快乐的→look happy看上去开心→look happily at开心地看着…

14.　 happen (v.) 碰巧发生→sb. happen to do sth. =It happens that…

I happened to meet the professor yesterday, =It happened to me that I met …

13.　 hang-hanged-hanged (绞死) hang-hung-hung (悬挂)

far-farther-farthest (距离远) far-further-furthest (程度深)