Experts found a large quantity of wall paintings, some of them_____ the Han Dynasty.

I’ve read all the books ________ you gave me.

I wonder whether there is a web ______ people can find a lot of information about the study of English.

Beijing took steps to limit the kinds of high-risk of borrowing money from the banks that can create the high price of housing, ______ happened in the United States．

This is the best way I could think of _____ the students _____ the rules.