1、 ________ a teacher and some students in the classroom.

2、 Most of us don't agree ________ the new manager.

3、  Mary __________ that piece of cake for twenty yuan.

4、  The mother ________ to the children: Be careful! Your sister is sleeping.

5、 The article ________ on this subject was written by Mr. Black.

6、 The table is made of ________.

7、  It's a bird. But I don't know __________ name.

8、  The books on the desk are not mine; they're ________.

9、 It ________ that he is still on the way.

10、  Mr. Smith has bought a lot of books, ________ he?

11、 I remember ________ it before somewhere.

12、  My little sister is five years old, __________ she can swim well.

13、  题目：You should always_ some time practicing English if you want to make progress.

14、 题目：_Of my parents was well educated, they both left school when they were 13.

15、  Hurry up. Don't keep Xiao Wang __________.