People along the river didn’t allow them to ________ a factory so as not to pollute the water.

10,000 dollars is a large sum of money，but it is still ______than we need for a new house

Zhengzhou was attacked by such a terrible sandstorm________ few residents had ever experienced before

We have brought in a good grain harvest for three years_________

The rivers in Changshun are clearer than _____ in Wuhan..