Patience is an important ____ of a happy and rewarding life. After all, some things are worth waiting for. 

It is always true that sometimes even if you have had a big dinner, _________ are that you will still want to reach for food when it gets late． 

 ---- Why don’t you try to do exercise to lose weight? ---- I have tried everything but it has made no _____________.

Burning all the lights in the classroom will be a great______ on electric power.

Next week there will be a basketball match between the ________ and the ________of our school.