I missed the first part of ________ film Avatar.－What a pity ! You should be here half _______ hour earlier.

The classroom is _________ clean _______ it was yesterday. ——Sorry, I forgot to clean it.

Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.

I don’t know if my uncle_______. If he______, I will be very happy.

30,000 dollars is a lot of money, but it’s _________ than we need.