پرسش‌ها با تگ (تست گرامر انگلیسی)

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

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

 We're having a barbecue next week, .......?

Over 1900 years ago, ………, who worked in Alexandria, Egypt, classified the stars  by their brightness.

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

 The versatility of modern cross-country skiing equipment allows skiers ………  technique to diverse terrain. 

 With the exception of mercury, ……… at standard temperature and pressure. 

 Mars, the fourth planet from the Sun, ...... of sky gazers. 

The foreign student advisor recommended that she ……… more English before  enrolling at the university. 

 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.