We are sad about the （pollute） of our environment．
When I （arrive） at the hotel，it was midnight．
There are （hundred） of sheep on the hill．
She was so （sleep） that she went to bed early．
without the polce's help，it，found，the girl，very difficult they，to find，called Wei Fang
（他们发现没有警察的帮助要想找到这个名叫书芳的女孩是非常困难的）．