We should develop the sunshine project actively, because it can save _______ resources as well as reduce pollution.

I am considering changing to a more interesting job, as the present job, which requires a lot of _______, nearly bores me to death. 

The speech delivered by the mayor of Shanghai on the opening ceremony of the World’s Swimming championship left me a deep ___________．

You’d better practice more and play better if you want to make a good ______ on the audience at the concerts.