آزمون آنلاین زبان انگلیسی 1 - درس 3 | آزمون شماره 28

Children are amazingly ……… ; they can play for hours without getting tired.

Tourism is one of the most important fields and its ……… will play basic role in promotion of understanding on national levels.

I hope this book will be of ....................... to both teachers and students.

 . The..........of fighter planes was followed with the creation of anti-aircraft guns