— Do you have any plan for this summer vacation, Mary?— Sure, I’ d like to be a volunteer and help to ______ the Central Park. 

—I really want to stop learning the piano. It’s too difficult for me.—Don’t do that. You should face the problems bravely.

The young woman always ______ sunglasses in the sun. 

 Why not _________ your teacher for advice when you don’t know __________ the problems?

 —Fire is very useful to human! —Yes, especially in winter a fire _____________warm.