Many human activities also _______carbon gases, which will result in global warming.

Enough of it! Nobody here thinks what you are saying should make any         

 Freddy made up his mind to enjoy his singing and to    ________  as many happy experiences as he could.

 Thanks to their hard work, the new bridge has been finished ________.

Though the “No smoking” signs have existed for long in public places, heavy smokers often ________ them and light up cigarettes.