1 . Scientists have advanced many theories about why human beings cry tears, ________________ (都没有得到证实). (根据汉语提示完成句子)

2 . Most of their musical instruments are really just sticks found on the ground,__________________________________(其中有一种令人惊叹的乐器) called the didgeridoo.(根据汉语提示完成句子)

3 . Indeed, his slim but strong body is just like that of millions of Chinese farmers, ________ whom he has ________ his life.(献身于，致力于)(根据汉语提示完成句子)

4 . This is the book, ________________ (它的封面) is designed by Mr Jones. （根据汉语提示填空）

5 . There are two buildings, ________________(较高的那一栋) stands nearly a hundred feet in height. (根据汉语提示填空)

6 . There are sixty students in our class in all, ________________(他们中的多数都来自农村)．（根据汉语提示填空）

9 . There are three conference rooms each of which ______ (配备了)a screen and audio visual equipment. (根据汉语提示完成句子)