12．Li Ping always guarantees not to be late again to his teacher．

11．The doctor was performing the operation at 4：00p．m．yesterday．

10．The black people were no longer bought and sold as slaves after the slave trade was abolished．

9．The celebration of that traditional festival ______ a great parade，singing and dancing．（　　）

A．

makes up of

B．

is made up

C．

is consisted of

D．

consists of

8．We can sometimes______ studies ______pleasure．（　　）

A．

mix；to

B．

mix；with

C．

mixes；with

D．

mixes；to

7．假如你是中学生李明，你有留学美国一年的经历．近日你的好友李华来信说她即将留学美国一年，向你咨询留学经验．请根据下列要点给她写封回信，提出你的建议．
字数：100词左右．
要求：（1）多练习英语口语；
（2）上课时多参与课堂讨论；
（3）与寄宿家庭关系融洽
（4）多参与社区志愿者活动．
Dear Li Hua，
I'm glad to hear that you are going to study in America for a year．To make your life in America a rewarding experience，I would like to share some useful tips with you．（高分句型一）
First of all，you need to practice your oral English so that you will have less trouble talking with the local people．（高分句型二）Secondly，you are encouraged to be active in class discussion so that you can develop your own idea on certain topics．Thirdly，when you stay with a host family，do your best to get along well with them by helping them with chores and so on．（高分句型三）More importantly，you can benefit greatly from your volunteering activities in your community．
I hope you will have a good time in America．
Yours，
LiMing．

6．They rewarded the boy with $5for bringing back the dog．

5．Socialcustoms （风俗） vary greatly from country to country．

4．She intended （打算） to catch the early train，but she didn't get up in time．

3．I apologised to her for stepping on her foot．