پرسش‌ها با تگ (تست گرامر)

 Although Margaret Mead had several assistants during her long investigations of  Samoa, the bulk of the research was done by ……… alone.  

 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. 

 ……… their differences, the three models resemble ……… in a crucial respect.   

Medical research at the cellular level, ……… research on the immune system, has been  made possible through twentieth-century advances in techniques of genetic research.  

Thirty-eight national sites are known as parks, another eighty-two as monuments,  and ……… 

Transplanting organs ……… has proved easier than transplanting muscles. 

 ……… is rooted in experiments in iron and steel conducted in the nineteenth  century. 

 Intended to display the work of twentieth-century artists, ……… in 1929.