19.A fox may grow gray, but never good. 江山易改，本性难移。
20.A friend in need is a friend indeed. 患难见真情。

常用语:
1.All right.
2.May I speak to Betty?
3.I'm Betty.
4.That's Betty.
5.She's speaking.
6.Would you like something to drink?
7.Yes,I'd like some coffee.
8. Yes,I'd like some cakes.
9.Yes, I do.
10.Yes, I can.
11.Would you like some fish?
12.No,of course not.
13.No,thanks.
14.No,I don't
15.Please don't
16.What can I do for you?
17.I can do it.
18.I'd like some oranges.
19.You can do it.
20.Yes,you do.
21.How much is the sweater?
22.There are many.
23.It's two kilos.
24.Thirty yuan.
25.There is much.
26.Excuse me ,Can you tell me the way to the No.1 People's Hospital,Pleace?
27.No, uou can't go there.
28.Yes,please.
29.Yes,it's next to that park.
30.How do you say that in English?
31.It's a picture.
32. It's "图画"
33.You can speak English.
34.You can say it in English.
35.Take good care of the books.
36.All right.Thank you.
37.Yes,I am.Thank you.
38.Yes, I do. 39.Yes, let's.
40.Don't read in the sun.It 's bad for your eyes.
41.Please do.
42.You're welcome.
43.Let's go to school.
44.Yes, please go there.
45.OK,Let's
46.Yes,I can.
47.Yes,you do.