What do you think of the summer camp–Wonderful! It’s the greatest ______ I have ever had.

It was really ______ of your brother not to play the guitar while you were having a rest.

If we use new types of energy， they will produce little pollution. ______ they cost very little and never run out.

Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power

People who eat breakfast are always in ________ spirits than those who don’t.