play a part (role) in 在...中起作用

　play a role of扮演......角色

　take part in参与

　take an active part in积极参加

3. novel n. a book-length story (长篇)小说 novel adj. 新颖的，新奇的

4. vanish vi. He vanished in the dark.

5. behave v. 举止;行为;举止端正 behavior n. 行为,举止

　behave oneself守规矩；举止得体 behave well/badly towards...对......态度好（坏）

　well-behaved adj.表现好的 badly-behaved adj.表现差的

　(1)How is your new car behaving?

　(2) He has behaved badly towards his wife.

　(3) Behave yourself; don't make a fool of yourself.

　(4) She behaves (towards me) more like a friend than a mother.

6. hesitate v. 犹豫，迟疑

　hesitate to do sth.迟疑做某事；不愿做某事

　hesitate in speaking 说话吞吞吐吐

　hesitate about/in/over...对......犹豫不决

　I hesitate to tell you the truth. 我不大想告诉你真相。

　Don't hesitate to tell us if you have a problem如果有疑问, 请尽管与我联系.

　She hesitated over the choice between the two dresses.

　hesitation n. without hesitation 毫不犹豫地

I accepted the job without hesitation.

　There is no room for hesitation.

7. doubt n.& vt. 怀疑 （注意句式区别）

　There is no doubt that...毫不怀疑...

　There is no need for sb. to do sth.某人没必要做某事

　It's no wonder that...难怪...

注意:doubt后接名词性从句时，疑问句和否定句用连词that ，肯定句用whether，if 等。如：

　There is no doubt that she will win.

　I don't doubt that she will win.

　I doubt whether she will win.

　Do you doubt that she will win?

　beyond / out of doubt毫无疑问地 no doubt无疑地

　without (a) doubt无疑地 in doubt 感到疑虑的，拿不准的

　doubtful adj. 怀疑的；疑惑的

8. direction n. 方向,指导,用法说明

　in the direction of朝......的方向

　in all directions=in every direction四面八方

　sense of direction方向感

　follow one's directions/ instructions遵循某人的指示

　under sb's direction/under the direction of sb在某人的指导下

　direct adj直接的，坦率的.adv.直接地

vt.指导go direct home/direct a company (a film) /direct sb to the post office