The audience are _______young people who like pop music at the concert.

Jack had to call a taxi because the box was _______ heavy to carry all the way home.

You must keep it _______ in mind that education is the first productivity. 

The boy was＿＿＿＿＿＿eager to get a geography book. 

 Each of us, ____old or young,is a valuable member of society.