Failure hurts adults and children ______ , but it can make a positive contribution to your life once you learn to use it.

--Students should devote most of their time to studying rather than playing computer games.  ---________. No pains, no gains.

Nowadays, a lot of children have less time to play and communicate with their peer due to extra studies. ________, it is difficult to develop their character and social skills. 

It is one thing to enjoy listening to good music, but it is      another to play it well yourself.

There are forty five students in our class, and they are _____ interested in football.