Bill was doing a lot of physical exercise to build up his______.

What my wish is to have a round-the-world_______after I retire.

The lady in red immediately became the _____ of attention when she entered the hall. 

—Whenever you want a good meal , come to my restaurant and eat for free.—Believe me , that is an ____ I will not refuse.

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