پرسش‌ها با تگ (تست گرامر)

Celluloid and plastics have largely replaced genuine ivory in the manufacture ……… buttons, billiard balls, and piano keys.

The chemical facts ……… as a by-product of their search for gold became the basis  for modern chemistry.  

Recently, severe management problems have afflicted Coca-Cola, ………

During the course of its growth, a frog undergoes a true metamorphosis ……… with  a fishlike larval stage.

Thirty-eight national sites are known as parks, another eighty-two as monuments,  and ………

 Through reproduction ………….. the properties of a species.

 Woodrow Wilson believed the United States' entry into World War I would put a —— to the war in months.

If you want to ……… health problems in the future, you should start exercising on a  daily basis. 

 Natural selection is defined as the process ………….. the course of evolution by preserving those traits best adapted for an organism’s survival.

 Many Middle Eastern diplomats still feel that the United States is intent —— the ultimate police in the region.