1.Have you ever been abroad(国外)
2.You should be dressed netly when you enter(进入)a concert hall.
3.I`d love to,but I will play against(与...对抗)the basketball team from No.2 iddle school.
4.If the temperature drops below(低于)0c,water freezes.
5.he is someone that I can find it easy to do business(生意)with.
6.I haven`t been to shanghai,Helen hasn`t been there,eihter(也).
首字母：
7.The more carefully you do your homework,the fewer mistakes you will make.
8.Mr.Li is a teacher of much experience.He has taught in several countries.
9.The astronauts who flew into space in shenzhou5 and shenzhou6 are the national heroes of China.
10.We were all really tired when we got to the top of the mountain.
11.Hangzhou is famous for the West Lake.