پرسش‌ها با تگ (تست گرامر)

The more advanced the specialization in production and the more complex the  economy, ……… to make any given good reach its ultimate user by using barter. 

I have left my book in ....... and I would like you to get it for me.

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

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

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

In so-called nonfiction novels, a documentary style is combined with fictional  techniques ……… actual events and people.

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

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

 In order to remain in existence, ……… must, in the long run, produce something  consumers consider useful or desirable.