It’s no use _____ my husband ________ money. He won’t take your advice.

How many nationalities ______ the  country   ______？ 

With the development of science and technology, the prices of TV sets have ________.

The children remembered to ______ themselves at first, but things went out of control minutes later.    

Some retired people have nothing to do. They often get together and ___for hours talking about their past experiences.