آزمون آنلاین انگلیسی 3 - درس سوم | آزمون شماره 327

The company is also developing two new ……… which it hopes will be strong enough to fill cavities in the back teeth.

In order to ................................ all of this knowledge , I must read every single page in this book.

Hamoun: You go and visit those children at the hospital every week. Are you paid for that?

Sahel: No. I am doing it ................ but if I want, I can use the hospital bus to go home.