پرسش‌ها با دسته‌بندی (زبان انگلیسی => زبان انگلیسی => گرامر)

سلام میشه با کلمه around جمله بسازید که تو جمله نقش prep داشته باشه؟

Any critic, teacher, librarian, or poet who hopes to broaden poetry’s audience faces  the difficult challenge of persuading skeptical readers ……… .

The discovery of the halftone process in photography in 1881 made it ……… 

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. 

سلام در جمله زیر چرا بعد از فعل ، s به کار رفته ؟ در صورتی که پاسخ میتونه چند نفر باشه Who helps lost children ? 

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