پرسش‌ها با تگ (گرامر)

Because the metal mercury —— in direct proportion to temperature, it was once used as the indicator in common thermometers.

Transfer of information takes place ……… in some way to the material that was  originally learned.

Although Margaret Mead had several assistants during her long investigations of  Samoa, the bulk of the research was done by ……… alone. 

Much of northern Canada lies within the Arctic Circle, and ……… ice or the sparse vegetation known as tundra.

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.  

—— east of the Mississippi River.

A leech, after —— the skin, is best removed by the application of either salt or heat.  

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