پرسش‌ها با تگ (تست گرامر)

Can you tell the difference ....... butter and margarine?

 By the end of this year I realize I ....... writing tests for three years now.

 I know it sounds unreasonable but it ....... that she will never come back.

a: 'We've collected thousands of pounds this week for charity.' b: '.......'

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.