شرکت در آزمون آنلاین انگلیسی 3 - درس دوم | آزمون شماره 1668

This article features ……… - works that have a similar meaning to the unknown words.

I .................... to save the man if I knew how to swim.

.   Young scientist is working at an astrophysical observatory doing research into the .................. of the universe