Scientists do ………. to fine out the secrets in their labs.
The foreign student advisor recommended that she ……… more English before enrolling at the university.
During the course of its growth, a frog undergoes a true metamorphosis ……… with a fishlike larval stage.
He failed the rest …. his efforts.
کدام یک از گزینههای زیر صحیح است؟
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.