پرسش‌ها با تگ (تست گرامر انگلیسی)

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.  

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