پرسش‌ها با تگ (گرامر انگلیسی)

کدام یک از گزینه‌های زیر صحیح است؟

The problem facing most tourists is ……… among so many possibilities.  

Medical research at the cellular level, ……… research on the immune system, has been  made possible through twentieth-century advances in techniques of genetic research.   

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. 

 What ....... be doing this time tomorrow?

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

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

When wood, natural gas, oil, or any other fuel burns, ……… with oxygen in air to  produce heat.

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

I've just ....... that the price has gone up again.