Many people like to talk about generation gaps. I don't think there is  ________       in my family though.

 Many students are playing sports on the playground.______ are playing soccer; ______are running and jumping.

They paid fifty percent of _____ they were able to earn to the state．

They produced two reports, ______ of which contained any useful suggestions.

We are seeking a prime minister, ______ who will devote himself to the interest of the country.