شرکت در آزمون آنلاین زبان انگلیسی 1 - درس 3 | آزمون شماره 23

So far we haven’t been able to find much about this metal, but we are still ......... on it.

……… in the deep part of the ocean, the sharks started to attack him.

To grow or change into a stronger, larger or better form could be one of the meanings of the word "...................  ."

We must love ...................... even if no one loves us.

The cause of death of Iranian doctor was the expired ........................ .