Though some foreign scientists had a ______ opinion of his new invention, his fellow workers never thought ____ of it.

As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.

As he works in a remote area, he visits his parents only__________.

Do you dress differently because of what you see in advertisements or buy things you might not ________buy？

----You seem to be burning yourself out with the coming exam!—--________. I'm dying for a thorough rest and a good workout.